Remove ~1750 superfluous includes from core

Source/core/html/HTMLCanvasElement.cpp

 /*
  * Copyright (C) 2004, 2006, 2007 Apple Inc. All rights reserved.
  * Copyright (C) 2007 Alp Toker <alp@atoker.com>
  * Copyright (C) 2010 Torch Mobile (Beijing) Co. Ltd. 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.
@@ skipping 14 matching lines @@
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #include "config.h"
 #include "core/html/HTMLCanvasElement.h"
 
 #include <math.h>
 #include <stdio.h>
 #include "HTMLNames.h"
 #include "bindings/v8/ScriptController.h"
-#include "core/dom/Attribute.h"
 #include "core/dom/Document.h"
 #include "core/dom/ExceptionCode.h"
 #include "core/dom/WebCoreMemoryInstrumentation.h"
 #include "core/html/ImageData.h"
 #include "core/html/canvas/Canvas2DContextAttributes.h"
-#include "core/html/canvas/CanvasGradient.h"
-#include "core/html/canvas/CanvasPattern.h"
 #include "core/html/canvas/CanvasRenderingContext2D.h"
-#include "core/html/canvas/CanvasStyle.h"
-#include "core/page/Chrome.h"
 #include "core/page/Frame.h"
-#include "core/page/Page.h"
 #include "RuntimeEnabledFeatures.h"
 #include "core/page/Settings.h"
 #include "core/platform/MIMETypeRegistry.h"
 #include "core/platform/graphics/GraphicsContextStateSaver.h"
 #include "core/platform/graphics/ImageBuffer.h"
 #include "core/rendering/RenderHTMLCanvas.h"
 
 #include "core/html/canvas/WebGLContextAttributes.h"
 #include "core/html/canvas/WebGLRenderingContext.h"
 
@@ skipping 529 matching lines @@
     HTMLElement::reportMemoryUsage(memoryObjectInfo);
     info.addMember(m_observers, "observers");
     info.addMember(m_context, "context");
     info.addMember(m_imageBuffer, "imageBuffer");
     info.addMember(m_contextStateSaver, "contextStateSaver");
     info.addMember(m_presentedImage, "presentedImage");
     info.addMember(m_copiedImage, "copiedImage");
 }
 
 }