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

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

-// 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.
-
-#include "content/renderer/media/renderer_webmidiaccessor_impl.h"
-
-#include "base/logging.h"
-#include "content/renderer/media/midi_message_filter.h"
-#include "content/renderer/render_thread_impl.h"
-
-namespace content {
-
-RendererWebMIDIAccessorImpl::RendererWebMIDIAccessorImpl(
-    WebKit::WebMIDIAccessorClient* client)
-    : client_(client) {
-  DCHECK(client_);
-}
-
-RendererWebMIDIAccessorImpl::~RendererWebMIDIAccessorImpl() {
-  midi_message_filter()->RemoveClient(client_);
-}
-
-void RendererWebMIDIAccessorImpl::requestAccess(bool access) {
-  midi_message_filter()->RequestAccess(client_, access ? 1 : 0);
-}
-
-void RendererWebMIDIAccessorImpl::sendMIDIData(
-    unsigned port_index,
-    const unsigned char* data,
-    size_t length,
-    double timestamp) {
-  midi_message_filter()->SendMIDIData(
-      port_index,
-      data,
-      length,
-      timestamp);
-}
-
-MIDIMessageFilter* RendererWebMIDIAccessorImpl::midi_message_filter() {
-  return RenderThreadImpl::current()->midi_message_filter();
-}
-
-}  // namespace content