blink: Cleanup core class forward declarations

third_party/WebKit/Source/core/layout/VerticalPositionCache.h

 /*
  * Copyright (C) 2010 Apple 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:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 15 matching lines @@
 #ifndef VerticalPositionCache_h
 #define VerticalPositionCache_h
 
 #include "core/layout/api/LineLayoutItem.h"
 #include "platform/fonts/FontBaseline.h"
 #include "wtf/Allocator.h"
 #include "wtf/HashMap.h"
 
 namespace blink {
 
-class LayoutObject;
 
 // Values for vertical alignment.
 const int PositionUndefined = 0x80000000;
 
 class VerticalPositionCache {
   STACK_ALLOCATED();
   WTF_MAKE_NONCOPYABLE(VerticalPositionCache);
 
  public:
   VerticalPositionCache() {}
@@ skipping 19 matching lines @@
   }
 
  private:
   HashMap<LineLayoutItem, int> m_alphabeticPositions;
   HashMap<LineLayoutItem, int> m_ideographicPositions;
 };
 
 }  // namespace blink
 
 #endif  // VerticalPositionCache_h