blink: Cleanup core class forward declarations

third_party/WebKit/Source/core/layout/svg/LayoutSVGResourceContainer.h

 /*
  * Copyright (C) Research In Motion Limited 2010. 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.
  *
  * This library is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
@@ skipping 19 matching lines @@
 enum LayoutSVGResourceType {
   MaskerResourceType,
   MarkerResourceType,
   PatternResourceType,
   LinearGradientResourceType,
   RadialGradientResourceType,
   FilterResourceType,
   ClipperResourceType
 };
 
-class PaintLayer;
-
 class LayoutSVGResourceContainer : public LayoutSVGHiddenContainer {
  public:
   explicit LayoutSVGResourceContainer(SVGElement*);
   ~LayoutSVGResourceContainer() override;
 
   virtual void removeAllClientsFromCache(bool markForInvalidation = true) = 0;
   virtual void removeClientFromCache(LayoutObject*,
                                      bool markForInvalidation = true) = 0;
 
   void layout() override;
@@ skipping 91 matching lines @@
                                 isSVGResourceContainer());
 
 #define DEFINE_LAYOUT_SVG_RESOURCE_TYPE_CASTS(thisType, typeName)   \
   DEFINE_TYPE_CASTS(thisType, LayoutSVGResourceContainer, resource, \
                     resource->resourceType() == typeName,           \
                     resource.resourceType() == typeName)
 
 }  // namespace blink
 
 #endif