Prefer to forward-declare GraphicsContext in headers.

Source/core/editing/Caret.cpp

 /*
  * Copyright (C) 2004, 2008, 2009, 2010 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 14 matching lines @@
 
 #include "config.h"
 #include "core/editing/Caret.h"
 
 #include "core/dom/Document.h"
 #include "core/editing/htmlediting.h"
 #include "core/frame/LocalFrame.h"
 #include "core/frame/Settings.h"
 #include "core/rendering/RenderBlock.h"
 #include "core/rendering/RenderView.h"
+#include "platform/graphics/GraphicsContext.h"
 
 namespace WebCore {
 
 CaretBase::CaretBase(CaretVisibility visibility)
     : m_caretRectNeedsUpdate(true)
     , m_caretVisibility(visibility)
 {
 }
 
 DragCaretController::DragCaretController()
@@ skipping 216 matching lines @@
     context->fillRect(caret, caretColor);
 }
 
 void DragCaretController::paintDragCaret(LocalFrame* frame, GraphicsContext* p, const LayoutPoint& paintOffset, const LayoutRect& clipRect) const
 {
     if (m_position.deepEquivalent().deprecatedNode()->document().frame() == frame)
         paintCaret(m_position.deepEquivalent().deprecatedNode(), p, paintOffset, clipRect);
 }
 
 }