Mac: Add "Show Tab Overview" menu item.

chrome/browser/app_controller_mac.h

 // Copyright (c) 2009 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_APP_CONTROLLER_MAC_H_
 #define CHROME_BROWSER_APP_CONTROLLER_MAC_H_
 #pragma once
 
 #import <Cocoa/Cocoa.h>
 #include <vector>
@@ skipping 32 matching lines @@
   // Outlets for the close tab/window menu items so that we can adjust the
   // commmand-key equivalent depending on the kind of window and how many
   // tabs it has.
   IBOutlet NSMenuItem* closeTabMenuItem_;
   IBOutlet NSMenuItem* closeWindowMenuItem_;
   BOOL fileMenuUpdatePending_;  // ensure we only do this once per notificaion.
 
   // Outlet for the help menu so we can bless it so Cocoa adds the search item
   // to it.
   IBOutlet NSMenu* helpMenu_;
+
+  // Outlet for the tabpose menu item so we can hide it.
+  IBOutlet NSMenuItem* tabposeMenuItem_;
 }
 
 @property(readonly, nonatomic) BOOL startupComplete;
 
 - (void)didEndMainMessageLoop;
 - (Profile*)defaultProfile;
 
 // Try to close all browser windows, and if that succeeds then quit.
 - (BOOL)tryToTerminateApplication:(NSApplication*)app;
 
@@ skipping 20 matching lines @@
 
 // Get the URLs that Launch Services expects the browser to open at startup.
 - (const std::vector<GURL>&)startupUrls;
 
 // Clear the list of startup URLs.
 - (void)clearStartupUrls;
 
 @end
 
 #endif