[MacViews] Use ChromeCommandDispatcherDelegate to handle keyboard shortcuts.

ui/views/widget/native_widget_mac.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.
 
 #include "ui/views/widget/native_widget_mac.h"
 
 #import <Cocoa/Cocoa.h>
 
 #include "base/mac/foundation_util.h"
 #include "base/mac/scoped_nsobject.h"
@@ skipping 551 matching lines @@
   bridge_->OnSizeConstraintsChanged();
 }
 
 void NativeWidgetMac::RepostNativeEvent(gfx::NativeEvent native_event) {
   NOTIMPLEMENTED();
 }
 
 ////////////////////////////////////////////////////////////////////////////////
 // NativeWidgetMac, protected:
 
-NSWindow* NativeWidgetMac::CreateNSWindow(const Widget::InitParams& params) {
+NativeWidgetMacNSWindow* NativeWidgetMac::CreateNSWindow(
+    const Widget::InitParams& params) {
   return [[[NativeWidgetMacNSWindow alloc]
       initWithContentRect:ui::kWindowSizeDeterminedLater
                 styleMask:StyleMaskForParams(params)
                   backing:NSBackingStoreBuffered
                     defer:NO] autorelease];
 }
 
 ////////////////////////////////////////////////////////////////////////////////
 // Widget, public:
 
@@ skipping 123 matching lines @@
   [[ViewsNSWindowCloseAnimator alloc] initWithWindow:window];
 }
 
 - (void)animationDidEnd:(NSAnimation*)animation {
   [window_ close];
   [animation_ setDelegate:nil];
   [self release];
 }
 
 @end