[Mac] Move UI item validation to UserInterfaceItemCommandHandler.

ui/views/cocoa/native_widget_mac_nswindow.h

 // Copyright 2014 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 UI_VIEWS_COCOA_NATIVE_WIDGET_MAC_NSWINDOW_H_
 #define UI_VIEWS_COCOA_NATIVE_WIDGET_MAC_NSWINDOW_H_
 
 #import <Cocoa/Cocoa.h>
 
 #import "ui/base/cocoa/command_dispatcher.h"
 #include "ui/views/views_export.h"
 
 // The NSWindow used by BridgedNativeWidget. Provides hooks into AppKit that
 // can only be accomplished by overriding methods.
 VIEWS_EXPORT
-@interface NativeWidgetMacNSWindow : NSWindow<CommandDispatchingWindow>
+@interface NativeWidgetMacNSWindow
+    : NSWindow<CommandDispatchingWindow, NSUserInterfaceValidations>

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

same here - NSUserInterfaceValidations is redundant

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

Done.

 
 // Set a CommandDispatcherDelegate, i.e. to implement key event handling.
 - (void)setCommandDispatcherDelegate:(id<CommandDispatcherDelegate>)delegate;
 
+// Set a UserInterfaceItemCommandHandler to validate UI items and execute
+// commands.
+- (void)setUserInterfaceItemCommandHandler:
+    (id<UserInterfaceItemCommandHandler>)commandHandler;
+
 @end
 
 #endif  // UI_VIEWS_COCOA_NATIVE_WIDGET_MAC_NSWINDOW_H_