Remove ~1750 superfluous includes from core

Source/core/platform/graphics/GraphicsLayer.cpp

 /*
  * Copyright (C) 2009 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 29 matching lines @@
 #include "core/platform/graphics/filters/SkiaImageFilterBuilder.h"
 #include "core/platform/graphics/skia/NativeImageSkia.h"
 #include "core/platform/graphics/transforms/RotateTransformOperation.h"
 #include "core/platform/text/TextStream.h"
 
 #include "wtf/CurrentTime.h"
 #include "wtf/HashMap.h"
 #include "wtf/HashSet.h"
 #include "wtf/MemoryInstrumentationHashMap.h"
 #include "wtf/MemoryInstrumentationVector.h"
-#include "wtf/StringExtras.h"
-#include "wtf/text/CString.h"
 #include "wtf/text/StringBuilder.h"
 #include "wtf/text/StringHash.h"
 #include "wtf/text/WTFString.h"
 
 #include <public/Platform.h>
 #include <public/WebAnimation.h>
 #include <public/WebCompositorSupport.h>
 #include <public/WebFilterOperation.h>
 #include <public/WebFilterOperations.h>
 #include <public/WebFloatPoint.h>
@@ skipping 1380 matching lines @@
 #ifndef NDEBUG
 void showGraphicsLayerTree(const WebCore::GraphicsLayer* layer)
 {
     if (!layer)
         return;
 
     String output = layer->layerTreeAsText(LayerTreeAsTextDebug | LayerTreeAsTextIncludeVisibleRects);
     fprintf(stderr, "%s\n", output.utf8().data());
 }
 #endif