mac: Remove now-unneeded includes of cocoa_protocols.h

content/shell/shell_mac.mm

 // 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.
 
 #include "content/shell/shell.h"
 
 #include <algorithm>
 
 #include "base/command_line.h"
 #include "base/logging.h"
-#import "base/mac/cocoa_protocols.h"
 #import "base/memory/scoped_nsobject.h"
 #include "base/string_piece.h"
 #include "base/sys_string_conversions.h"
 #include "content/public/browser/native_web_keyboard_event.h"
 #include "content/public/browser/web_contents.h"
 #include "content/public/browser/web_contents_view.h"
 #include "content/shell/resource.h"
 #include "content/shell/shell_switches.h"
 #include "googleurl/src/gurl.h"
 #import "ui/base/cocoa/underlay_opengl_hosting_window.h"
@@ skipping 259 matching lines @@
   if (event.skip_in_browser)
     return;
 
   // The event handling to get this strictly right is a tangle; cheat here a bit
   // by just letting the menus have a chance at it.
   if ([event.os_event type] == NSKeyDown)
     [[NSApp mainMenu] performKeyEquivalent:event.os_event];
 }
 
 }  // namespace content