Revert of Introduce WebMediaSession

content/renderer/media/android/webmediasession_android.h

Index: content/renderer/media/android/webmediasession_android.h
diff --git a/content/renderer/media/android/webmediasession_android.h b/content/renderer/media/android/webmediasession_android.h
deleted file mode 100644
index 3ae7e165bbb6f2d501d460234d494e934ac9d6f9..0000000000000000000000000000000000000000
--- a/content/renderer/media/android/webmediasession_android.h
+++ /dev/null
@@ -1,27 +0,0 @@
-// 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_RENDERER_MEDIA_ANDROID_WEBMEDIASESSION_ANDROID_H_
-#define CONTENT_RENDERER_MEDIA_ANDROID_WEBMEDIASESSION_ANDROID_H_
-
-#include "base/macros.h"
-#include "third_party/WebKit/public/platform/modules/mediasession/WebMediaSession.h"
-
-namespace content {
-
-class WebMediaSessionAndroid : public blink::WebMediaSession {
- public:
-  WebMediaSessionAndroid() = default;
-  virtual ~WebMediaSessionAndroid() = default;
-
-  void activate(blink::WebMediaSessionActivateCallback*) override;
-  void deactivate(blink::WebMediaSessionDeactivateCallback*) override;
-
- private:
-  DISALLOW_COPY_AND_ASSIGN(WebMediaSessionAndroid);
-};
-
-}  // namespace content
-
-#endif  // CONTENT_RENDERER_MEDIA_ANDROID_WEBMEDIASESSION_ANDROID_H_