blink: Cleanup class forward declarations

third_party/WebKit/Source/platform/heap/HeapPage.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 112 matching lines @@
   do {                                           \
   } while (false)
 #endif
 
 #if !ENABLE(ASSERT) && CPU(64BIT)
 #define USE_4BYTE_HEADER_PADDING 1
 #else
 #define USE_4BYTE_HEADER_PADDING 0
 #endif
 
-class CallbackStack;
-class FreePagePool;
 class NormalPageArena;
-class OrphanedPagePool;
 class PageMemory;
-class PageMemoryRegion;
-class WebMemoryAllocatorDump;
 
 // HeapObjectHeader is 4 byte (32 bit) that has the following layout:
 //
 // | gcInfoIndex (14 bit) |
 // | DOM mark bit (1 bit) |
 // | size (14 bit)        |
 // | dead bit (1 bit)     |
 // | freed bit (1 bit)    |
 // | mark bit (1 bit)     |
 //
@@ skipping 775 matching lines @@
   return outOfLineAllocate(allocationSize, gcInfoIndex);
 }
 
 inline NormalPageArena* NormalPage::arenaForNormalPage() const {
   return static_cast<NormalPageArena*>(arena());
 }
 
 }  // namespace blink
 
 #endif  // HeapPage_h