Revert 207992: This looks like a reland of r207983, which was reverted in

trunk/src/content/renderer/media/renderer_webmidiaccessor_impl.h

Index: trunk/src/content/renderer/media/renderer_webmidiaccessor_impl.h
===================================================================
--- trunk/src/content/renderer/media/renderer_webmidiaccessor_impl.h	(revision 207994)
+++ trunk/src/content/renderer/media/renderer_webmidiaccessor_impl.h	(working copy)
@@ -1,41 +0,0 @@
-// Copyright (c) 2013 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_RENDERER_WEBMIDIACCESSOR_IMPL_H_
-#define CONTENT_RENDERER_MEDIA_RENDERER_WEBMIDIACCESSOR_IMPL_H_
-
-#include "base/basictypes.h"
-#include "base/compiler_specific.h"
-#include "third_party/WebKit/public/platform/WebMIDIAccessor.h"
-#include "third_party/WebKit/public/platform/WebMIDIAccessorClient.h"
-
-namespace content {
-
-class MIDIMessageFilter;
-
-class RendererWebMIDIAccessorImpl
-    : public WebKit::WebMIDIAccessor {
- public:
-  explicit RendererWebMIDIAccessorImpl(
-      WebKit::WebMIDIAccessorClient* client);
-  virtual ~RendererWebMIDIAccessorImpl();
-
-  // WebKit::WebMIDIAccessor implementation.
-  virtual void requestAccess(bool access) OVERRIDE;
-  virtual void sendMIDIData(unsigned port_index,
-                            const unsigned char* data,
-                            size_t length,
-                            double timestamp) OVERRIDE;
-
- private:
-  WebKit::WebMIDIAccessorClient* client_;
-
-  MIDIMessageFilter* midi_message_filter();
-
-  DISALLOW_COPY_AND_ASSIGN(RendererWebMIDIAccessorImpl);
-};
-
-}  // namespace content
-
-#endif  // CONTENT_RENDERER_MEDIA_RENDERER_WEBMIDIACCESSOR_IMPL_H_