Remove ThreadHeap::m_threads

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

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 142 matching lines @@
     }
     ~SweepForbiddenScope() {
       ASSERT(m_state->m_sweepForbidden);
       m_state->m_sweepForbidden = false;
     }
 
    private:
     ThreadState* m_state;
   };
 
-  void lockThreadAttachMutex();
-  void unlockThreadAttachMutex();
-
   static void attachMainThread();
 
   // Associate ThreadState object with the current thread. After this
   // call thread can start using the garbage collected heap infrastructure.
   // It also has to periodically check for safepoints.
   static void attachCurrentThread();
 
   // Disassociate attached ThreadState from the current thread. The thread
   // can no longer use the garbage collected heap after this call.
   static void detachCurrentThread();
@@ skipping 428 matching lines @@
 
   void invokePreFinalizers();
 
   void takeSnapshot(SnapshotType);
   void clearArenaAges();
   int arenaIndexOfVectorArenaLeastRecentlyExpanded(int beginArenaIndex,
                                                    int endArenaIndex);
 
   void reportMemoryToV8();
 
-  // Should only be called under protection of threadAttachMutex().
   const Vector<std::unique_ptr<BlinkGCInterruptor>>& interruptors() const {
     return m_interruptors;
   }
 
   friend class SafePointBarrier;
   friend class SafePointScope;
 
   static WTF::ThreadSpecific<ThreadState*>* s_threadSpecific;
 
   // We can't create a static member of type ThreadState here
   // because it will introduce global constructor and destructor.
   // We would like to manage lifetime of the ThreadState attached
   // to the main thread explicitly instead and still use normal
   // constructor and destructor for the ThreadState class.
   // For this we reserve static storage for the main ThreadState
   // and lazily construct ThreadState in it using placement new.
   static uint8_t s_mainThreadStateStorage[];
 
-  ThreadHeap* m_heap;
+  std::unique_ptr<ThreadHeap> m_heap;
   ThreadIdentifier m_thread;
   std::unique_ptr<PersistentRegion> m_persistentRegion;
   BlinkGC::StackState m_stackState;
   intptr_t* m_startOfStack;
   intptr_t* m_endOfStack;
 
   void* m_safePointScopeMarker;
   Vector<Address> m_safePointStackCopy;
   bool m_atSafePoint;
   Vector<std::unique_ptr<BlinkGCInterruptor>> m_interruptors;
@@ skipping 75 matching lines @@
 class ThreadStateFor<AnyThread> {
   STATIC_ONLY(ThreadStateFor);
 
  public:
   static ThreadState* state() { return ThreadState::current(); }
 };
 
 }  // namespace blink
 
 #endif  // ThreadState_h