blink: Cleanup class forward declarations

third_party/WebKit/Source/platform/heap/Heap.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 29 matching lines @@
 #include "platform/heap/Visitor.h"
 #include "wtf/AddressSanitizer.h"
 #include "wtf/Allocator.h"
 #include "wtf/Assertions.h"
 #include "wtf/Atomics.h"
 #include "wtf/Forward.h"
 #include <memory>
 
 namespace blink {
 
+class FreePagePool;
+class OrphanedPagePool;
+
 class PLATFORM_EXPORT HeapAllocHooks {
  public:
   // TODO(hajimehoshi): Pass a type name of the allocated object.
   typedef void AllocationHook(Address, size_t, const char*);
   typedef void FreeHook(Address);
 
   static void setAllocationHook(AllocationHook* hook) {
     m_allocationHook = hook;
   }
   static void setFreeHook(FreeHook* hook) { m_freeHook = hook; }
@@ skipping 613 matching lines @@
 template <typename T>
 void VisitorHelper<Derived>::handleWeakCell(Visitor* self, void* object) {
   T** cell = reinterpret_cast<T**>(object);
   if (*cell && !ObjectAliveTrait<T>::isHeapObjectAlive(*cell))
     *cell = nullptr;
 }
 
 }  // namespace blink
 
 #endif  // Heap_h