InstantExtended: Remove overlay control code.

chrome/browser/search/instant_extended_context_menu_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_BROWSER_SEARCH_INSTANT_EXTENDED_CONTEXT_MENU_OBSERVER_H_
-#define CHROME_BROWSER_SEARCH_INSTANT_EXTENDED_CONTEXT_MENU_OBSERVER_H_
-
-#include "base/basictypes.h"
-#include "base/compiler_specific.h"
-#include "chrome/browser/tab_contents/render_view_context_menu_observer.h"
-
-namespace content {
-class WebContents;
-}
-
-// This class disables menu items which perform poorly in instant extended mode.
-class InstantExtendedContextMenuObserver
-    : public RenderViewContextMenuObserver {
- public:
-  explicit InstantExtendedContextMenuObserver(content::WebContents* contents);
-  virtual ~InstantExtendedContextMenuObserver();
-
-  // RenderViewContextMenuObserver implementation.
-  virtual bool IsCommandIdSupported(int command_id) OVERRIDE;
-  virtual bool IsCommandIdEnabled(int command_id) OVERRIDE;
-
- private:
-  // Whether the source web contents of the context menu corresponds to an
-  // Instant overlay.
-  const bool is_instant_overlay_;
-
-  DISALLOW_COPY_AND_ASSIGN(InstantExtendedContextMenuObserver);
-};
-
-#endif  // CHROME_BROWSER_SEARCH_INSTANT_EXTENDED_CONTEXT_MENU_OBSERVER_H_