[Mac] Move UI item validation to UserInterfaceItemCommandHandler.

chrome/browser/ui/cocoa/chrome_event_processing_window.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.
 
 #ifndef CHROME_BROWSER_UI_COCOA_CHROME_EVENT_PROCESSING_WINDOW_H_
 #define CHROME_BROWSER_UI_COCOA_CHROME_EVENT_PROCESSING_WINDOW_H_
 
 #import <Cocoa/Cocoa.h>
 
 #import "base/mac/scoped_nsobject.h"
 #import "ui/base/cocoa/command_dispatcher.h"
 #import "ui/base/cocoa/underlay_opengl_hosting_window.h"
 
 @class ChromeCommandDispatcherDelegate;
 
 // Override NSWindow to access unhandled keyboard events (for command
 // processing); subclassing NSWindow is the only method to do
 // this.
 @interface ChromeEventProcessingWindow
-    : UnderlayOpenGLHostingWindow<CommandDispatchingWindow>
+    : UnderlayOpenGLHostingWindow<CommandDispatchingWindow,
+                                  NSUserInterfaceValidations>

[tapted, 2015/09/03 04:15:38]

NSWindow already conforms to NSUserInterfaceValidations so I think this is
redundant

[jackhou1, 2015/09/03 06:15:39]

Done.

 
 // Checks if |event| is a window, delayed window, or browser keyboard shortcut.
 // (See global_keyboard_shortcuts_mac.h for details). If so, execute the
 // associated command. Returns YES if the event was handled.
 - (BOOL)handleExtraKeyboardShortcut:(NSEvent*)event;
 
 @end
 
 #endif  // CHROME_BROWSER_UI_COCOA_CHROME_EVENT_PROCESSING_WINDOW_H_