--- a/src/3rdparty/chromium/third_party/protobuf/src/google/protobuf/compiler/js/js_generator.cc	2018-04-11 10:36:36.215724331 +0000
+++ b/src/3rdparty/chromium/third_party/protobuf/src/google/protobuf/compiler/js/js_generator.cc	2018-04-11 10:37:01.204216307 +0000
@@ -488,6 +488,7 @@
       return "U8";
     default:
       assert(false);
+      __builtin_unreachable ();
   }
 }