Revert of Introduce WebMediaSession

third_party/WebKit/Source/modules/mediasession/MediaSessionError.cpp

Index: third_party/WebKit/Source/modules/mediasession/MediaSessionError.cpp
diff --git a/third_party/WebKit/Source/modules/mediasession/MediaSessionError.cpp b/third_party/WebKit/Source/modules/mediasession/MediaSessionError.cpp
deleted file mode 100644
index e4d9f460a1857b03dc1bee51a9d6db4db3603f4e..0000000000000000000000000000000000000000
--- a/third_party/WebKit/Source/modules/mediasession/MediaSessionError.cpp
+++ /dev/null
@@ -1,22 +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.
-
-#include "config.h"
-#include "modules/mediasession/MediaSessionError.h"
-
-#include "bindings/core/v8/ScriptPromiseResolver.h"
-#include "core/dom/DOMException.h"
-#include "core/dom/ExceptionCode.h"
-#include "public/platform/modules/mediasession/WebMediaSessionError.h"
-
-namespace blink {
-
-// static
-DOMException* MediaSessionError::take(ScriptPromiseResolver*, const WebMediaSessionError& webError)
-{
-    ASSERT(webError == WebMediaSessionError::Activate);
-    return DOMException::create(InvalidStateError, "The media session activation failed.");
-}
-
-} // namespace blink