[Mac] Move UI item validation to UserInterfaceItemCommandHandler.

chrome/browser/ui/cocoa/chrome_event_processing_window.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.
 
 #import "chrome/browser/ui/cocoa/chrome_event_processing_window.h"
 
 #include "base/logging.h"
 #import "chrome/browser/ui/cocoa/chrome_command_dispatcher_delegate.h"
 
 @implementation ChromeEventProcessingWindow
 
 - (instancetype)initWithContentRect:(NSRect)contentRect
                           styleMask:(NSUInteger)windowStyle
                             backing:(NSBackingStoreType)bufferingType
                               defer:(BOOL)deferCreation {
   if ((self = [super initWithContentRect:contentRect
                                styleMask:windowStyle
                                  backing:bufferingType
                                    defer:deferCreation])) {
     commandDispatcher_.reset([[CommandDispatcher alloc] initWithOwner:self]);
     commandDispatcherDelegate_.reset(
         [[ChromeCommandDispatcherDelegate alloc] init]);
     [commandDispatcher_ setDelegate:commandDispatcherDelegate_];
+    [self setCommandHandler:commandDispatcherDelegate_];
   }
   return self;
 }
 
 - (BOOL)handleExtraKeyboardShortcut:(NSEvent*)event {
   return [commandDispatcherDelegate_ handleExtraKeyboardShortcut:event
                                                           window:self];
 }
 
 // CommandDispatchingWindow implementation.
 
+@synthesize commandHandler;
+
 - (BOOL)redispatchKeyEvent:(NSEvent*)event {
   return [commandDispatcher_ redispatchKeyEvent:event];
 }
 
 - (BOOL)defaultPerformKeyEquivalent:(NSEvent*)event {
   return [super performKeyEquivalent:event];
 }
 
+- (BOOL)validateUserInterfaceItem:(id<NSValidatedUserInterfaceItem>)item {
+  return [[self commandHandler] validateUserInterfaceItem:item window:self];
+}
+
+- (void)commandDispatch:(id)sender {
+  [[self commandHandler] commandDispatch:sender window:self];
+}
+
+- (void)commandDispatchUsingKeyModifiers:(id)sender {
+  [[self commandHandler] commandDispatchUsingKeyModifiers:sender window:self];
+}
+
 // NSWindow overrides.
 
 - (BOOL)performKeyEquivalent:(NSEvent*)event {
   return [commandDispatcher_ performKeyEquivalent:event];
 }
 
 - (void)sendEvent:(NSEvent*)event {
   if (![commandDispatcher_ preSendEvent:event])
     [super sendEvent:event];
 }
 
 @end  // ChromeEventProcessingWindow