Remove some unused includes from core/css and core/dom

Source/core/css/CSSImageGeneratorValue.cpp

 /*
  * Copyright (C) 2008 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 13 matching lines @@
  */
 
 #include "config.h"
 #include "core/css/CSSImageGeneratorValue.h"
 
 #include "core/css/CSSCanvasValue.h"
 #include "core/css/CSSCrossfadeValue.h"
 #include "core/css/CSSGradientValue.h"
 #include "core/dom/WebCoreMemoryInstrumentation.h"
 #include "core/platform/graphics/Image.h"
-#include "core/rendering/RenderObject.h"
 #include <wtf/MemoryInstrumentationHashCountedSet.h>
 #include <wtf/MemoryInstrumentationHashMap.h>
 #include <wtf/text/WTFString.h>
 
 
 namespace WTF {
 
 template<> struct SequenceMemoryInstrumentationTraits<const WebCore::RenderObject*> {
     template <typename I> static void reportMemoryUsage(I, I, MemoryClassInfo&) { }
 };
@@ skipping 182 matching lines @@
         break;
     case RadialGradientClass:
         static_cast<CSSRadialGradientValue*>(this)->loadSubimages(cachedResourceLoader);
         break;
     default:
         ASSERT_NOT_REACHED();
     }
 }
 
 } // namespace WebCore