Make MediaSession available on Desktop

content/browser/media/session/browser_media_session_manager.h

 // Copyright 2015 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 CONTENT_BROWSER_MEDIA_ANDROID_BROWSER_MEDIA_SESSION_MANAGER_H_
-#define CONTENT_BROWSER_MEDIA_ANDROID_BROWSER_MEDIA_SESSION_MANAGER_H_
+#ifndef CONTENT_BROWSER_MEDIA_SESSION_BROWSER_MEDIA_SESSION_MANAGER_H_
+#define CONTENT_BROWSER_MEDIA_SESSION_BROWSER_MEDIA_SESSION_MANAGER_H_
 
 #include "base/macros.h"
 #include "base/optional.h"
 #include "content/common/content_export.h"
 
 namespace IPC {
 class Message;
 }  // namespace IPC
 
 namespace content {
 
 class RenderFrameHost;
 struct MediaMetadata;
 
 class CONTENT_EXPORT BrowserMediaSessionManager {
  public:
   explicit BrowserMediaSessionManager(RenderFrameHost* render_frame_host);
+  virtual ~BrowserMediaSessionManager() = default;
 
   virtual void OnSetMetadata(int session_id,
                              const base::Optional<MediaMetadata>& metadata);
 
  private:
   RenderFrameHost* const render_frame_host_;
 
   DISALLOW_COPY_AND_ASSIGN(BrowserMediaSessionManager);
 };
 
 }  // namespace content
 
-#endif  // CONTENT_BROWSER_MEDIA_ANDROID_BROWSER_MEDIA_SESSION_MANAGER_H_
+#endif  // CONTENT_BROWSER_MEDIA_SESSION_BROWSER_MEDIA_SESSION_MANAGER_H_