chromecast: Cleanup class/struct fwd declarations

chromecast/browser/cast_content_browser_client.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_CAST_CONTENT_BROWSER_CLIENT_H_
 #define CHROMECAST_BROWSER_CAST_CONTENT_BROWSER_CLIENT_H_
 
 #include <map>
 #include <memory>
 #include <string>
 #include <vector>
 
 #include "base/macros.h"
 #include "build/build_config.h"
 #include "content/public/browser/certificate_request_result_type.h"
 #include "content/public/browser/content_browser_client.h"
 
 class PrefService;
 
 namespace breakpad {
 class CrashHandlerHostLinux;
 }
 
-namespace media {
-class BrowserCdmFactory;
-}
-
 namespace metrics {
 class MetricsService;
 }
 
 namespace net {
 class URLRequestContextGetter;
 class X509Certificate;
 }
 
 namespace service_manager {
@@ skipping 171 matching lines @@
   CastBrowserMainParts* cast_browser_main_parts_;
   std::unique_ptr<URLRequestContextFactory> url_request_context_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(CastContentBrowserClient);
 };
 
 }  // namespace shell
 }  // namespace chromecast
 
 #endif  // CHROMECAST_BROWSER_CAST_CONTENT_BROWSER_CLIENT_H_