Remove ThreadHeap::m_threads

third_party/WebKit/Source/platform/heap/ThreadState.h

Index: third_party/WebKit/Source/platform/heap/ThreadState.h
diff --git a/third_party/WebKit/Source/platform/heap/ThreadState.h b/third_party/WebKit/Source/platform/heap/ThreadState.h
index 82c9934c2e3f2b3ed0e776c1319bdde581804633..9f82f3568c56e787f09e5103a42cabbdb371d2fe 100644
--- a/third_party/WebKit/Source/platform/heap/ThreadState.h
+++ b/third_party/WebKit/Source/platform/heap/ThreadState.h
@@ -160,9 +160,6 @@ class PLATFORM_EXPORT ThreadState {
     ThreadState* m_state;
   };
 
-  void lockThreadAttachMutex();
-  void unlockThreadAttachMutex();
-
   static void attachMainThread();
 
   // Associate ThreadState object with the current thread. After this
@@ -611,7 +608,6 @@ class PLATFORM_EXPORT ThreadState {
 
   void reportMemoryToV8();
 
-  // Should only be called under protection of threadAttachMutex().
   const Vector<std::unique_ptr<BlinkGCInterruptor>>& interruptors() const {
     return m_interruptors;
   }