Refactor the Heap into ThreadHeap to prepare for per thread heaps

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

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "config.h"
 #include "platform/heap/PagePool.h"
 
 #include "platform/heap/Heap.h"
 #include "platform/heap/PageMemory.h"
 #include "wtf/Assertions.h"
@@ skipping 84 matching lines @@
             // pages are reused.
             // NOTE: We call the destructor before freeing or adding to the
             // free page pool.
             PageMemory* memory = page->storage();
             if (page->isLargeObjectPage()) {
                 page->~BasePage();
                 delete memory;
             } else {
                 page->~BasePage();
                 clearMemory(memory);
-                Heap::freePagePool()->addFreePage(index, memory);
+                page->heap()->threadState()->freePagePool()->addFreePage(index, memory);
             }
 
             PoolEntry* deadEntry = entry;
             entry = entry->next;
             *prevNext = entry;
             delete deadEntry;
         }
     }
 }
 
@@ skipping 29 matching lines @@
             BasePage* page = entry->data;
             if (page->contains(reinterpret_cast<Address>(object)))
                 return true;
         }
     }
     return false;
 }
 #endif
 
 } // namespace blink