Revert of Rename Heap to ThreadHeap

third_party/WebKit/Source/web/WebHeap.cpp

 /*
  * Copyright (C) 2014 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 29 matching lines @@
     ThreadState::current()->enterSafePoint(BlinkGC::HeapPointersOnStack, this);
 }
 
 WebHeap::SafePointScope::~SafePointScope()
 {
     ThreadState::current()->leaveSafePoint();
 }
 
 void WebHeap::collectGarbageForTesting()
 {
-    ThreadHeap::collectGarbage(BlinkGC::HeapPointersOnStack, BlinkGC::GCWithSweep, BlinkGC::ForcedGC);
+    Heap::collectGarbage(BlinkGC::HeapPointersOnStack, BlinkGC::GCWithSweep, BlinkGC::ForcedGC);
 }
 
 void WebHeap::collectAllGarbageForTesting()
 {
-    ThreadHeap::collectAllGarbage();
+    Heap::collectAllGarbage();
 }
 
 } // namespace blink