[Chromecast] Turn CastContentWindow into an abstract interface.

chromecast/browser/service/cast_service_simple.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 CHROMECAST_BROWSER_SERVICE_CAST_SERVICE_SIMPLE_H_
 #define CHROMECAST_BROWSER_SERVICE_CAST_SERVICE_SIMPLE_H_
 
 #include <memory>
 
 #include "base/macros.h"
+#include "chromecast/browser/cast_content_window.h"
 #include "chromecast/service/cast_service.h"
 #include "url/gurl.h"
 
 namespace content {
 class WebContents;
 }
 
 namespace chromecast {
 namespace shell {
-class CastContentWindow;
 
-class CastServiceSimple : public CastService {
+class CastServiceSimple : public CastService,
+                          public CastContentWindow::Delegate {
  public:
   CastServiceSimple(content::BrowserContext* browser_context,
                     PrefService* pref_service);
   ~CastServiceSimple() override;
 
  protected:
   // CastService implementation:
   void InitializeInternal() override;
   void FinalizeInternal() override;
   void StartInternal() override;
   void StopInternal() override;
 
+  // CastContentWindow::Delegate implementation:
+  void OnWindowDestroyed() override;
+  void OnKeyEvent(const ui::KeyEvent& key_event) override;
+
  private:
   std::unique_ptr<CastContentWindow> window_;
   std::unique_ptr<content::WebContents> web_contents_;
   GURL startup_url_;
 
   DISALLOW_COPY_AND_ASSIGN(CastServiceSimple);
 };
 
 }  // namespace shell
 }  // namespace chromecast
 
 #endif  // CHROMECAST_BROWSER_SERVICE_CAST_SERVICE_SIMPLE_H_