Unbundle assorted lexing/parsing/transpiling tools written in Python.

--- a/mojo/public/tools/mojom/mojom/BUILD.gn
+++ b/mojo/public/tools/mojom/mojom/BUILD.gn
@@ -21,7 +21,6 @@
 
     # Third-party module dependencies
     "//third_party/jinja2/",
-    "//third_party/ply/",
   ]
 }
 
--- a/third_party/blink/renderer/bindings/scripts/build_web_idl_database.pydeps
+++ b/third_party/blink/renderer/bindings/scripts/build_web_idl_database.pydeps
@@ -2,10 +2,6 @@
 #   build/print_python_deps.py --root third_party/blink/renderer/bindings/scripts --output third_party/blink/renderer/bindings/scripts/build_web_idl_database.pydeps third_party/blink/renderer/bindings/scripts/build_web_idl_database.py
 ../../../../../tools/idl_parser/__init__.py
 ../../../../../tools/idl_parser/idl_node.py
-../../../../pyjson5/src/json5/__init__.py
-../../../../pyjson5/src/json5/lib.py
-../../../../pyjson5/src/json5/parser.py
-../../../../pyjson5/src/json5/version.py
 ../../build/scripts/blinkbuild/__init__.py
 ../../build/scripts/blinkbuild/name_style_converter.py
 build_web_idl_database.py
--- a/third_party/blink/renderer/bindings/scripts/collect_idl_files.pydeps
+++ b/third_party/blink/renderer/bindings/scripts/collect_idl_files.pydeps
@@ -4,13 +4,6 @@
 ../../../../../tools/idl_parser/idl_lexer.py
 ../../../../../tools/idl_parser/idl_node.py
 ../../../../../tools/idl_parser/idl_parser.py
-../../../../ply/__init__.py
-../../../../ply/lex.py
-../../../../ply/yacc.py
-../../../../pyjson5/src/json5/__init__.py
-../../../../pyjson5/src/json5/lib.py
-../../../../pyjson5/src/json5/parser.py
-../../../../pyjson5/src/json5/version.py
 ../../build/scripts/blinkbuild/__init__.py
 ../../build/scripts/blinkbuild/name_style_converter.py
 collect_idl_files.py
--- a/third_party/blink/renderer/bindings/scripts/generate_bindings.pydeps
+++ b/third_party/blink/renderer/bindings/scripts/generate_bindings.pydeps
@@ -2,29 +2,6 @@
 #   build/print_python_deps.py --root third_party/blink/renderer/bindings/scripts --output third_party/blink/renderer/bindings/scripts/generate_bindings.pydeps third_party/blink/renderer/bindings/scripts/generate_bindings.py
 ../../../../../tools/idl_parser/__init__.py
 ../../../../../tools/idl_parser/idl_node.py
-../../../../mako/mako/mako/__init__.py
-../../../../mako/mako/mako/_ast_util.py
-../../../../mako/mako/mako/ast.py
-../../../../mako/mako/mako/cache.py
-../../../../mako/mako/mako/codegen.py
-../../../../mako/mako/mako/compat.py
-../../../../mako/mako/mako/exceptions.py
-../../../../mako/mako/mako/ext/__init__.py
-../../../../mako/mako/mako/filters.py
-../../../../mako/mako/mako/lexer.py
-../../../../mako/mako/mako/parsetree.py
-../../../../mako/mako/mako/pygen.py
-../../../../mako/mako/mako/pyparser.py
-../../../../mako/mako/mako/runtime.py
-../../../../mako/mako/mako/template.py
-../../../../mako/mako/mako/util.py
-../../../../markupsafe/__init__.py
-../../../../markupsafe/_compat.py
-../../../../markupsafe/_native.py
-../../../../pyjson5/src/json5/__init__.py
-../../../../pyjson5/src/json5/lib.py
-../../../../pyjson5/src/json5/parser.py
-../../../../pyjson5/src/json5/version.py
 ../../build/scripts/blinkbuild/__init__.py
 ../../build/scripts/blinkbuild/name_style_converter.py
 bind_gen/__init__.py
--- src/third_party/blink/renderer/bindings/scripts/check_generated_file_list.pydeps.old	2022-11-30 10:28:05.822183900 +0000
+++ src/third_party/blink/renderer/bindings/scripts/check_generated_file_list.pydeps	2022-11-30 19:51:45.562760400 +0000
@@ -2,29 +2,6 @@
 #   build/print_python_deps.py --root third_party/blink/renderer/bindings/scripts --output third_party/blink/renderer/bindings/scripts/check_generated_file_list.pydeps third_party/blink/renderer/bindings/scripts/check_generated_file_list.py
 ../../../../../tools/idl_parser/__init__.py
 ../../../../../tools/idl_parser/idl_node.py
-../../../../mako/mako/mako/__init__.py
-../../../../mako/mako/mako/_ast_util.py
-../../../../mako/mako/mako/ast.py
-../../../../mako/mako/mako/cache.py
-../../../../mako/mako/mako/codegen.py
-../../../../mako/mako/mako/compat.py
-../../../../mako/mako/mako/exceptions.py
-../../../../mako/mako/mako/ext/__init__.py
-../../../../mako/mako/mako/filters.py
-../../../../mako/mako/mako/lexer.py
-../../../../mako/mako/mako/parsetree.py
-../../../../mako/mako/mako/pygen.py
-../../../../mako/mako/mako/pyparser.py
-../../../../mako/mako/mako/runtime.py
-../../../../mako/mako/mako/template.py
-../../../../mako/mako/mako/util.py
-../../../../markupsafe/__init__.py
-../../../../markupsafe/_compat.py
-../../../../markupsafe/_native.py
-../../../../pyjson5/src/json5/__init__.py
-../../../../pyjson5/src/json5/lib.py
-../../../../pyjson5/src/json5/parser.py
-../../../../pyjson5/src/json5/version.py
 ../../build/scripts/blinkbuild/__init__.py
 ../../build/scripts/blinkbuild/name_style_converter.py
 bind_gen/__init__.py
--- src/third_party/blink/renderer/bindings/scripts/validate_web_idl.pydeps.old	2022-11-30 10:28:05.822183900 +0000
+++ src/third_party/blink/renderer/bindings/scripts/validate_web_idl.pydeps	2022-11-30 20:00:16.870556700 +0000
@@ -2,10 +2,6 @@
 #   build/print_python_deps.py --root third_party/blink/renderer/bindings/scripts --output third_party/blink/renderer/bindings/scripts/validate_web_idl.pydeps third_party/blink/renderer/bindings/scripts/validate_web_idl.py
 ../../../../../tools/idl_parser/__init__.py
 ../../../../../tools/idl_parser/idl_node.py
-../../../../pyjson5/src/json5/__init__.py
-../../../../pyjson5/src/json5/lib.py
-../../../../pyjson5/src/json5/parser.py
-../../../../pyjson5/src/json5/version.py
 ../../build/scripts/blinkbuild/__init__.py
 ../../build/scripts/blinkbuild/name_style_converter.py
 validate_web_idl.py
--- src/mojo/public/tools/bindings/mojom.gni.orig	2025-04-11 12:05:21.530272509 +0200
+++ src/mojo/public/tools/bindings/mojom.gni	2025-04-11 20:56:50.579500868 +0200
@@ -802,7 +802,7 @@ template("mojom") {
 
     action("${parser_target_name}_action") {
       script = mojom_parser_script
-      inputs = mojom_parser_sources + ply_sources + [ build_metadata_filename ]
+      inputs = mojom_parser_sources + [ build_metadata_filename ]
       sources = sources_list
       public_deps = parser_deps
       outputs = action_outputs
--- src/third_party/blink/renderer/build/scripts/scripts.gni.orig	2024-12-08 18:35:01.138006834 +0100
+++ src/third_party/blink/renderer/build/scripts/scripts.gni	2024-12-18 13:24:36.436191575 +0100
@@ -18,10 +18,6 @@ if (is_ios) {
 _scripts_dir = "//third_party/blink/renderer/build/scripts"
 
 scripts_for_json5_files = jinja2_sources + [
-                            "//third_party/pyjson5/src/json5/__init__.py",
-                            "//third_party/pyjson5/src/json5/lib.py",
-                            "//third_party/pyjson5/src/json5/parser.py",
-                            "//third_party/pyjson5/src/json5/version.py",
                             "$_scripts_dir/blinkbuild/name_style_converter.py",
                             "$_scripts_dir/json5_generator.py",
                             "$_scripts_dir/license.py",
--- src/third_party/blink/renderer/bindings/scripts/generate_event_interface_names.pydeps.old
+++ src/third_party/blink/renderer/bindings/scripts/generate_event_interface_names.pydeps
@@ -2,10 +2,6 @@
 #   build/print_python_deps.py --root third_party/blink/renderer/bindings/scripts --output third_party/blink/renderer/bindings/scripts/generate_event_interface_names.pydeps third_party/blink/renderer/bindings/scripts/generate_event_interface_names.py
 ../../../../../tools/idl_parser/__init__.py
 ../../../../../tools/idl_parser/idl_node.py
-../../../../pyjson5/src/json5/__init__.py
-../../../../pyjson5/src/json5/lib.py
-../../../../pyjson5/src/json5/parser.py
-../../../../pyjson5/src/json5/version.py
 ../../build/scripts/blinkbuild/__init__.py
 ../../build/scripts/blinkbuild/name_style_converter.py
 generate_event_interface_names.py
--- src/third_party/jinja2/jinja2.gni.old	2023-11-09 21:20:56.224381300 +0100
+++ src/third_party/jinja2/jinja2.gni	2023-11-09 22:34:58.269569800 +0100
@@ -1,6 +1,7 @@
 import("//third_party/markupsafe/markupsafe.gni")
 
-jinja2_sources = [
+jinja2_sources = []
+xjinja2_sourcesx = [
                    "//third_party/jinja2/__init__.py",
                    "//third_party/jinja2/_identifier.py",
                    "//third_party/jinja2/async_utils.py",
--- src/third_party/blink/renderer/core/sanitizer/builtins_all_known.py.orig	2025-04-16 14:36:32.677312629 +0200
+++ src/third_party/blink/renderer/core/sanitizer/builtins_all_known.py	2025-04-16 21:52:51.840741724 +0200
@@ -13,7 +13,7 @@ namespace that Blink's C++ implementatio
 import json
 import optparse
 import sys
-from pyjson5.src import json5
+import json5
 
 
 def error(context, *infos):