Partially revert r181835 to fix link highlighting

Source/web/LinkHighlight.h

 /*
  * Copyright (C) 2012 Google 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
@@ skipping 21 matching lines @@
 #include "platform/graphics/Path.h"
 #include "public/platform/WebCompositorAnimationDelegate.h"
 #include "public/platform/WebContentLayer.h"
 #include "public/platform/WebContentLayerClient.h"
 #include "public/platform/WebLayer.h"
 #include "wtf/OwnPtr.h"
 #include "wtf/Vector.h"
 
 namespace blink {
 
-class DisplayList;
 class Node;
 class RenderLayerModelObject;
 struct WebRect;
 class WebViewImpl;
 
 class LinkHighlight final : public WebContentLayerClient, public WebCompositorAnimationDelegate, blink::LinkHighlightClient {
 public:
     static PassOwnPtr<LinkHighlight> create(Node*, WebViewImpl*);
     virtual ~LinkHighlight();
 
@@ skipping 24 matching lines @@
 
     void attachLinkHighlightToCompositingLayer(const RenderLayerModelObject* paintInvalidationContainer);
     void clearGraphicsLayerLinkHighlightPointer();
     // This function computes the highlight path, and returns true if it has changed
     // size since the last call to this function.
     bool computeHighlightLayerPathAndPosition(const RenderLayerModelObject*);
 
     OwnPtr<WebContentLayer> m_contentLayer;
     OwnPtr<WebLayer> m_clipLayer;
     Path m_path;
-    RefPtr<DisplayList> m_displayList;
 
     RefPtrWillBePersistent<Node> m_node;
     WebViewImpl* m_owningWebViewImpl;
     GraphicsLayer* m_currentGraphicsLayer;
 
     bool m_geometryNeedsUpdate;
     bool m_isAnimating;
     double m_startTime;
 };
 
 } // namespace blink
 
 #endif