Let Chrome app handle Ash accelerators first if the app is launched as a window

ash/shell/shell_delegate_impl.cc

 // 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.
 
 #include "ash/shell/shell_delegate_impl.h"
 
 #include "ash/shell/example_factory.h"
 #include "ash/shell/launcher_delegate_impl.h"
 #include "ash/shell/toplevel_window.h"
 #include "ash/shell_window_ids.h"
@@ skipping 45 matching lines @@
   MessageLoopForUI::current()->Quit();
 }
 
 void ShellDelegateImpl::NewWindow(bool incognito) {
   ash::shell::ToplevelWindow::CreateParams create_params;
   create_params.can_resize = true;
   create_params.can_maximize = true;
   ash::shell::ToplevelWindow::CreateToplevelWindow(create_params);
 }
 
+bool ShellDelegateImpl::IsBrowserWindow(const aura::Window* window) {
+  return false;
+}
+
 void ShellDelegateImpl::Search() {
 }
 
 void ShellDelegateImpl::OpenFileManager() {
 }
 
 void ShellDelegateImpl::OpenCrosh() {
 }
 
 void ShellDelegateImpl::OpenMobileSetup() {
@@ skipping 18 matching lines @@
     ash::SystemTray* tray) {
   return NULL;
 }
 
 ash::UserWallpaperDelegate* ShellDelegateImpl::CreateUserWallpaperDelegate() {
   return NULL;
 }
 
 }  // namespace shell
 }  // namespace ash