Changed AppListDialogContentsView to extend DialogDelegate

ui/views/widget/widget.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 "ui/views/widget/widget.h"
 
 #include "base/debug/trace_event.h"
 #include "base/logging.h"
 #include "base/message_loop/message_loop.h"
 #include "base/strings/utf_string_conversions.h"
@@ skipping 984 matching lines @@
 }
 
 ////////////////////////////////////////////////////////////////////////////////
 // Widget, NativeWidgetDelegate implementation:
 
 bool Widget::IsModal() const {
   return widget_delegate_->GetModalType() != ui::MODAL_TYPE_NONE;
 }
 
 bool Widget::IsDialogBox() const {
-  return !!widget_delegate_->AsDialogDelegate();
+  return widget_delegate_->IsDialogBox();
 }
 
 bool Widget::CanActivate() const {
   return widget_delegate_->CanActivate();
 }
 
 bool Widget::IsInactiveRenderingDisabled() const {
   return disable_inactive_rendering_;
 }
 
@@ skipping 495 matching lines @@
 
 ////////////////////////////////////////////////////////////////////////////////
 // internal::NativeWidgetPrivate, NativeWidget implementation:
 
 internal::NativeWidgetPrivate* NativeWidgetPrivate::AsNativeWidgetPrivate() {
   return this;
 }
 
 }  // namespace internal
 }  // namespace views