Add Copy URL option to Omnibox context menu when URL is replaced by Instant Extended.

chrome/browser/ui/omnibox/omnibox_view.h

 // Copyright (c) 2012 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.
 
 // This file defines the interface class OmniboxView.  Each toolkit will
 // implement the edit view differently, so that code is inherently platform
 // specific.  However, the OmniboxEditModel needs to do some communication with
 // the view.  Since the model is shared between platforms, we need to define an
 // interface that all view implementations will share.
 
@@ skipping 227 matching lines @@
   // Return the number of characters in the current buffer. The name
   // |GetTextLength| can't be used as the Windows override of this class
   // inherits from a class that defines a method with that name.
   virtual int GetOmniboxTextLength() const = 0;
 
   // Try to parse the current text as a URL and colorize the components.
   virtual void EmphasizeURLComponents() = 0;
 
   OmniboxEditController* controller() { return controller_; }
   ToolbarModel* toolbar_model() { return toolbar_model_; }
+  const ToolbarModel* toolbar_model() const { return toolbar_model_; }
 
  private:
   // |model_| can be NULL in tests.
   scoped_ptr<OmniboxEditModel> model_;
   OmniboxEditController* controller_;
   ToolbarModel* toolbar_model_;
 
   // The object that handles additional command functionality exposed on the
   // edit, such as invoking the keyword editor.
   CommandUpdater* command_updater_;
 };
 
 #endif  // CHROME_BROWSER_UI_OMNIBOX_OMNIBOX_VIEW_H_