Use Widget frame and WidgetDelegate in ActvityWidget

athena/content/web_activity.h

 // 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.
 
 #ifndef ATHENA_CONTENT_PUBLIC_WEB_ACTIVITY_H_
 #define ATHENA_CONTENT_PUBLIC_WEB_ACTIVITY_H_
 
 #include "athena/activity/public/activity.h"
 #include "athena/activity/public/activity_view_model.h"
 #include "content/public/browser/web_contents_observer.h"
 
 namespace content {
 class BrowserContext;
 class WebContents;
 }
 
 namespace views {
 class WebView;
+class WidgetDelegate;
 }
 
 namespace athena {
 
 class WebActivity : public Activity,
                     public ActivityViewModel,
                     public content::WebContentsObserver {
  public:
   WebActivity(content::BrowserContext* context, const GURL& gurl);
   virtual ~WebActivity();
 
  protected:
   // Activity:
   virtual athena::ActivityViewModel* GetActivityViewModel() OVERRIDE;
 
   // ActivityViewModel:
   virtual void Init() OVERRIDE;
-  virtual SkColor GetRepresentativeColor() OVERRIDE;
-  virtual base::string16 GetTitle() OVERRIDE;
+  virtual SkColor GetRepresentativeColor() const OVERRIDE;
+  virtual base::string16 GetTitle() const OVERRIDE;
+  virtual bool UsesFrame() const OVERRIDE;
   virtual views::View* GetContentsView() OVERRIDE;
 
   // content::WebContentsObserver:
   virtual void TitleWasSet(content::NavigationEntry* entry,
                            bool explicit_set) OVERRIDE;
   virtual void DidUpdateFaviconURL(
       const std::vector<content::FaviconURL>& candidates) OVERRIDE;
 
  private:
   content::BrowserContext* browser_context_;
-  content::WebContents* web_contents_;
   const GURL url_;
   views::WebView* web_view_;
 
   DISALLOW_COPY_AND_ASSIGN(WebActivity);
 };
 
 }  // namespace athena
 
 #endif  // ATHENA_CONTENT_WEB_ACTIVITY_H_