athena: Introduce ActivityView.

athena/activity/activity_widget_delegate.cc

 // 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 "athena/activity/activity_widget_delegate.h"
 
 #include "athena/activity/activity_frame_view.h"
 #include "athena/activity/public/activity_view_model.h"
 #include "ui/views/view.h"
 #include "ui/views/window/client_view.h"
@@ skipping 32 matching lines @@
 }
 
 const views::Widget* ActivityWidgetDelegate::GetWidget() const {
   return const_cast<ActivityWidgetDelegate*>(this)->GetWidget();
 }
 
 views::View* ActivityWidgetDelegate::GetContentsView() {
   return view_model_->GetContentsView();
 }
 
-views::ClientView* ActivityWidgetDelegate::CreateClientView(
-    views::Widget* widget) {
-  return new views::ClientView(widget, view_model_->GetContentsView());
-}
-
 views::NonClientFrameView* ActivityWidgetDelegate::CreateNonClientFrameView(
     views::Widget* widget) {
   return new ActivityFrameView(widget, view_model_);
 }
 
 }  // namespace athena