Clean up forward declarations in Source/platform

Source/platform/text/TextRun.h

 /*
  * Copyright (C) 2000 Lars Knoll (knoll@kde.org)
  *           (C) 2000 Antti Koivisto (koivisto@kde.org)
  *           (C) 2000 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2003, 2006, 2007, 2011 Apple Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
@@ skipping 19 matching lines @@
 #include "platform/heap/Heap.h"
 #include "platform/text/TextDirection.h"
 #include "platform/text/TextPath.h"
 #include "wtf/RefCounted.h"
 #include "wtf/text/WTFString.h"
 
 class SkTextBlob;
 
 namespace blink {
 
-class FloatPoint;
-class Font;
-class GraphicsContext;
-class GlyphBuffer;
-class SimpleFontData;
-struct GlyphData;
-struct SimpleShaper;
-
 class PLATFORM_EXPORT TextRun {
     WTF_MAKE_FAST_ALLOCATED;
 public:
     enum ExpansionBehaviorFlags {
         ForbidTrailingExpansion = 0 << 0,
         AllowTrailingExpansion = 1 << 0,
         ForbidLeadingExpansion = 0 << 1,
         AllowLeadingExpansion = 1 << 1,
     };
 
@@ skipping 210 matching lines @@
 
     const TextRun& run;
     int from;
     int to;
     FloatRect bounds;
     RefPtr<const SkTextBlob>* cachedTextBlob;
 };
 
 }
 #endif