Clean up forward declarations in Source/platform

Source/platform/geometry/LayoutSize.h

 /*
  * Copyright (c) 2012, 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 19 matching lines @@
 
 #ifndef LayoutSize_h
 #define LayoutSize_h
 
 #include "platform/LayoutUnit.h"
 #include "platform/geometry/FloatSize.h"
 #include "platform/geometry/IntSize.h"
 
 namespace blink {
 
-class LayoutPoint;
-
 enum AspectRatioFit {
     AspectRatioFitShrink,
     AspectRatioFitGrow
 };
 
 class LayoutSize {
 public:
     LayoutSize() { }
     LayoutSize(const IntSize& size) : m_width(size.width()), m_height(size.height()) { }
     LayoutSize(LayoutUnit width, LayoutUnit height) : m_width(width), m_height(height) { }
@@ skipping 133 matching lines @@
 }
 
 inline LayoutSize roundedLayoutSize(const FloatSize& s)
 {
     return LayoutSize(s);
 }
 
 } // namespace blink
 
 #endif // LayoutSize_h