Revert of Add enablePerThreadHeap flag to ThreadState

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 572810db2ddc431d87214d24be63fe8f2ae56589..255c5c627515f749f1a8e327a35304ec2dcbdc4a 100644
--- a/third_party/WebKit/Source/platform/heap/ThreadState.h
+++ b/third_party/WebKit/Source/platform/heap/ThreadState.h
@@ -173,8 +173,6 @@
     void lockThreadAttachMutex();
     void unlockThreadAttachMutex();
 
-    bool perThreadHeapEnabled() const { return m_perThreadHeapEnabled; }
-
     bool isTerminating() { return m_isTerminating; }
 
     static void attachMainThread();
@@ -184,7 +182,7 @@
     // 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(bool perThreadHeapEnabled);
+    static void attachCurrentThread();
 
     // Disassociate attached ThreadState from the current thread. The thread
     // can no longer use the garbage collected heap after this call.
@@ -529,7 +527,7 @@
         FreelistSnapshot
     };
 
-    ThreadState(bool perThreadHeapEnabled);
+    ThreadState();
     ~ThreadState();
 
     NO_SANITIZE_ADDRESS void copyStackUntilSafePointScope();
@@ -639,7 +637,6 @@
     size_t m_arenaAges[BlinkGC::NumberOfArenas];
     size_t m_currentArenaAges;
 
-    bool m_perThreadHeapEnabled;
     bool m_isTerminating;
     GarbageCollectedMixinConstructorMarker* m_gcMixinMarker;