[MacViews] Use ChromeCommandDispatcherDelegate to handle keyboard shortcuts.

ui/views/cocoa/native_widget_mac_nswindow.mm

 // 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.
 
 #import "ui/views/cocoa/native_widget_mac_nswindow.h"
 
 #include "base/mac/foundation_util.h"
 #import "ui/views/cocoa/views_nswindow_delegate.h"
 #include "ui/views/controls/menu/menu_controller.h"
 #include "ui/views/widget/native_widget_mac.h"
@@ skipping 20 matching lines @@
                               defer:(BOOL)deferCreation {
   if ((self = [super initWithContentRect:contentRect
                                styleMask:windowStyle
                                  backing:bufferingType
                                    defer:deferCreation])) {
     commandDispatcher_.reset([[CommandDispatcher alloc] initWithOwner:self]);
   }
   return self;
 }
 
+// Public methods.
+
+- (void)setCommandDispatcherDelegate:(id<CommandDispatcherDelegate>)delegate {
+  [commandDispatcher_ setDelegate:delegate];
+}
+
+// Private methods.
+
 - (ViewsNSWindowDelegate*)viewsNSWindowDelegate {
   return base::mac::ObjCCastStrict<ViewsNSWindowDelegate>([self delegate]);
 }
 
 - (views::Widget*)viewsWidget {
   return [[self viewsNSWindowDelegate] nativeWidgetMac]->GetWidget();
 }
 
 - (BOOL)hasViewsMenuActive {
   views::MenuController* menuController =
       views::MenuController::GetActiveInstance();
   return menuController && menuController->owner() == [self viewsWidget];
 }
 
+// NSWindow overrides.
+
 - (BOOL)_isTitleHidden {
   if (![self delegate])
     return NO;
 
   return ![self viewsWidget]->widget_delegate()->ShouldShowWindowTitle();
 }
 
 // Ignore [super canBecome{Key,Main}Window]. The default is NO for windows with
 // NSBorderlessWindowMask, which is not the desired behavior.
 // Note these can be called via -[NSWindow close] while the widget is being torn
@@ skipping 87 matching lines @@
 
 - (BOOL)redispatchKeyEvent:(NSEvent*)event {
   return [commandDispatcher_ redispatchKeyEvent:event];
 }
 
 - (BOOL)defaultPerformKeyEquivalent:(NSEvent*)event {
   return [super performKeyEquivalent:event];
 }
 
 @end