Revert of Introduce WebMediaSession

third_party/WebKit/public/platform/modules/mediasession/WebMediaSession.h

Index: third_party/WebKit/public/platform/modules/mediasession/WebMediaSession.h
diff --git a/third_party/WebKit/public/platform/modules/mediasession/WebMediaSession.h b/third_party/WebKit/public/platform/modules/mediasession/WebMediaSession.h
deleted file mode 100644
index dd6e2e95b85d2b7e68e39cad923655817f8f36ef..0000000000000000000000000000000000000000
--- a/third_party/WebKit/public/platform/modules/mediasession/WebMediaSession.h
+++ /dev/null
@@ -1,26 +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 WebMediaSession_h
-#define WebMediaSession_h
-
-#include "public/platform/WebCallbacks.h"
-#include "public/platform/modules/mediasession/WebMediaSessionError.h"
-
-namespace blink {
-
-using WebMediaSessionActivateCallback = WebCallbacks<void, const WebMediaSessionError&>;
-using WebMediaSessionDeactivateCallback = WebCallbacks<void, void>;
-
-class WebMediaSession {
-public:
-    virtual ~WebMediaSession() = default;
-
-    virtual void activate(WebMediaSessionActivateCallback*) = 0;
-    virtual void deactivate(WebMediaSessionDeactivateCallback*) = 0;
-};
-
-} // namespace blink
-
-#endif // WebMediaSession_h