Move GetContextMenuNode from RenderView to RenderFrame.

chrome/renderer/chrome_render_frame_observer.h

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CHROME_RENDERER_CHROME_RENDER_FRAME_OBSERVER_H_
 #define CHROME_RENDERER_CHROME_RENDER_FRAME_OBSERVER_H_
 
 #include "content/public/renderer/render_frame_observer.h"
 
+namespace gfx {
+class Size;
+}
+
 // This class holds the Chrome specific parts of RenderFrame, and has the same
 // lifetime.
 class ChromeRenderFrameObserver : public content::RenderFrameObserver {
  public:
   explicit ChromeRenderFrameObserver(content::RenderFrame* render_frame);
   virtual ~ChromeRenderFrameObserver();
 
  private:
   // RenderFrameObserver implementation.
   virtual bool OnMessageReceived(const IPC::Message& message) OVERRIDE;
 
   // IPC handlers
   void OnSetIsPrerendering(bool is_prerendering);
+  void OnRequestThumbnailForContextNode(
+      int thumbnail_min_area_pixels,
+      const gfx::Size& thumbnail_max_size_pixels);
+  void OnPrintNodeUnderContextMenu();
 
   DISALLOW_COPY_AND_ASSIGN(ChromeRenderFrameObserver);
 };
 
 #endif  // CHROME_RENDERER_CHROME_RENDER_FRAME_OBSERVER_H_