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

trunk/src/content/renderer/renderer_webkitplatformsupport_impl.cc

Index: trunk/src/content/renderer/renderer_webkitplatformsupport_impl.cc
===================================================================
--- trunk/src/content/renderer/renderer_webkitplatformsupport_impl.cc	(revision 207994)
+++ trunk/src/content/renderer/renderer_webkitplatformsupport_impl.cc	(working copy)
@@ -31,7 +31,6 @@
 #include "content/renderer/hyphenator/hyphenator.h"
 #include "content/renderer/media/media_stream_dependency_factory.h"
 #include "content/renderer/media/renderer_webaudiodevice_impl.h"
-#include "content/renderer/media/renderer_webmidiaccessor_impl.h"
 #include "content/renderer/media/webcontentdecryptionmodule_impl.h"
 #include "content/renderer/render_thread_impl.h"
 #include "content/renderer/renderer_clipboard_client.h"
@@ -92,7 +91,6 @@
 using WebKit::WebFrame;
 using WebKit::WebGamepads;
 using WebKit::WebIDBFactory;
-using WebKit::WebMIDIAccessor;
 using WebKit::Platform;
 using WebKit::WebMediaStreamCenter;
 using WebKit::WebMediaStreamCenterClient;
@@ -773,14 +771,6 @@
 
 //------------------------------------------------------------------------------
 
-WebKit::WebMIDIAccessor*
-RendererWebKitPlatformSupportImpl::createMIDIAccessor(
-    WebKit::WebMIDIAccessorClient* client) {
-  return new RendererWebMIDIAccessorImpl(client);
-}
-
-//------------------------------------------------------------------------------
-
 WebKit::WebString
 RendererWebKitPlatformSupportImpl::signedPublicKeyAndChallengeString(
     unsigned key_size_index,