Update MidiDispatcher to use Mojo Permission Service.

content/browser/web_contents/web_contents_impl.cc

Index: content/browser/web_contents/web_contents_impl.cc
diff --git a/content/browser/web_contents/web_contents_impl.cc b/content/browser/web_contents/web_contents_impl.cc
index 7ab54bf0cab318432f04509f45773d236b9ffafb..3951d0f5616e509f3737a4bddbf298da49d49755 100644
--- a/content/browser/web_contents/web_contents_impl.cc
+++ b/content/browser/web_contents/web_contents_impl.cc
@@ -41,7 +41,6 @@
 #include "content/browser/manifest/manifest_manager_host.h"
 #include "content/browser/media/audio_stream_monitor.h"
 #include "content/browser/media/capture/web_contents_audio_muter.h"
-#include "content/browser/media/midi_dispatcher_host.h"
 #include "content/browser/message_port_message_filter.h"
 #include "content/browser/message_port_service.h"
 #include "content/browser/plugin_content_origin_whitelist.h"
@@ -1189,8 +1188,6 @@ void WebContentsImpl::Init(const WebContents::CreateParams& params) {
                  NOTIFICATION_RENDER_WIDGET_HOST_DESTROYED,
                  NotificationService::AllBrowserContextsAndSources());
 
-  midi_dispatcher_host_.reset(new MidiDispatcherHost(this));
-
   screen_orientation_dispatcher_host_.reset(
       new ScreenOrientationDispatcherHostImpl(this));