mac: Remove now-unneeded includes of cocoa_protocols.h

content/shell/shell_login_dialog_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_login_dialog.h"
 
 #import <Cocoa/Cocoa.h>
 
 #include "base/logging.h"
 #include "base/mac/bundle_locations.h"
-#import "base/mac/cocoa_protocols.h"
 #import "base/memory/scoped_nsobject.h"
 #include "base/sys_string_conversions.h"
 #include "content/public/browser/browser_thread.h"
 #import "ui/base/cocoa/nib_loading.h"
 
 namespace {
 
 const int kUsernameFieldTag = 1;
 const int kPasswordFieldTag = 2;
 
@@ skipping 92 matching lines @@
   [helper_ release];
   helper_ = nil;
 }
 
 void ShellLoginDialog::PlatformRequestCancelled() {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
   [helper_ cancel];
 }
 
 }  // namespace content