Remove ThreadHeap::m_threads

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

Index: third_party/WebKit/Source/platform/heap/ThreadState.cpp
diff --git a/third_party/WebKit/Source/platform/heap/ThreadState.cpp b/third_party/WebKit/Source/platform/heap/ThreadState.cpp
index 2860b2c855581756d1d5312a3f0eee4e27b07b5c..2566ba92b40767cb5d2779d2a543d6d31ac631e1 100644
--- a/third_party/WebKit/Source/platform/heap/ThreadState.cpp
+++ b/third_party/WebKit/Source/platform/heap/ThreadState.cpp
@@ -1218,10 +1218,7 @@ void ThreadState::addInterruptor(
     std::unique_ptr<BlinkGCInterruptor> interruptor) {
   ASSERT(checkThread());
   SafePointScope scope(BlinkGC::HeapPointersOnStack);
-  {
-    MutexLocker locker(m_heap->threadAttachMutex());
-    m_interruptors.push_back(std::move(interruptor));
-  }
+  m_interruptors.push_back(std::move(interruptor));
 }
 
 void ThreadState::registerStaticPersistentNode(
@@ -1268,14 +1265,6 @@ void ThreadState::leaveStaticReferenceRegistrationDisabledScope() {
 }
 #endif
 
-void ThreadState::lockThreadAttachMutex() {
-  m_heap->threadAttachMutex().lock();
-}
-
-void ThreadState::unlockThreadAttachMutex() {
-  m_heap->threadAttachMutex().unlock();
-}
-
 void ThreadState::invokePreFinalizers() {
   ASSERT(checkThread());
   ASSERT(!sweepForbidden());