--- a/base/thread_annotations.h	2022-06-21 21:52:33.363987695 +0200
+++ b/base/thread_annotations.h	2022-06-24 16:18:54.238568316 +0200
@@ -40,6 +40,8 @@
 #include "base/dcheck_is_on.h"
 #include "build/build_config.h"
 
+#include <absl/base/internal/thread_annotations.h>
+
 #if defined(__clang__)
 #define THREAD_ANNOTATION_ATTRIBUTE__(x) __attribute__((x))
 #else
@@ -227,21 +229,7 @@
 // but the compiler cannot confirm that.
 #define TS_UNCHECKED_READ(x) thread_safety_analysis::ts_unchecked_read(x)
 
-namespace thread_safety_analysis {
-
-// Takes a reference to a guarded data member, and returns an unguarded
-// reference.
-template <typename T>
-inline const T& ts_unchecked_read(const T& v) NO_THREAD_SAFETY_ANALYSIS {
-  return v;
-}
-
-template <typename T>
-inline T& ts_unchecked_read(T& v) NO_THREAD_SAFETY_ANALYSIS {
-  return v;
-}
 
-}  // namespace thread_safety_analysis
 
 // The above is imported as-is from abseil-cpp. The following Chromium-specific
 // synonyms are added for Chromium concepts (SequenceChecker/ThreadChecker).