athena: Remove ActivityViewModel::CreateWidget().

athena/content/web_activity.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/content/web_activity.h"
 
 #include "athena/activity/public/activity_factory.h"
 #include "athena/activity/public/activity_manager.h"
 #include "athena/content/content_proxy.h"
 #include "athena/content/media_utils.h"
@@ skipping 510 matching lines @@
   return web_view_->visible() && current_state_ != ACTIVITY_UNLOADED;
 }
 
 Activity::ActivityMediaState WebActivity::GetMediaState() {
   return current_state_ == ACTIVITY_UNLOADED ?
       Activity::ACTIVITY_MEDIA_STATE_NONE :
       GetActivityMediaState(GetWebContents());
 }
 
 aura::Window* WebActivity::GetWindow() {
-  return web_view_->GetWidget()->GetNativeWindow();
+  return web_view_->GetWidget() ? web_view_->GetWidget()->GetNativeWindow()
+                                : nullptr;
 }
 
 content::WebContents* WebActivity::GetWebContents() {
   return web_view_->GetWebContents();
 }
 
 void WebActivity::Init() {
   web_view_->InstallAccelerators();
 }
 
@@ skipping 15 matching lines @@
 }
 
 bool WebActivity::UsesFrame() const {
   return true;
 }
 
 views::View* WebActivity::GetContentsView() {
   return web_view_;
 }
 
-views::Widget* WebActivity::CreateWidget() {
-  return nullptr;  // Use default widget.
-}
-
 gfx::ImageSkia WebActivity::GetOverviewModeImage() {
   if (content_proxy_.get())
     return content_proxy_->GetContentImage();
   return gfx::ImageSkia();
 }
 
 void WebActivity::PrepareContentsForOverview() {
   // Turn on fast resizing to avoid re-laying out the web contents when
   // entering / exiting overview mode and the content is visible.
   if (!content_proxy_.get())
@@ skipping 63 matching lines @@
   if (content_proxy_.get())
     content_proxy_.reset(nullptr);
 }
 
 void WebActivity::ShowContentProxy() {
   if (!content_proxy_.get())
     content_proxy_.reset(new ContentProxy(web_view_));
 }
 
 }  // namespace athena