Revert of Web MIDI: use mojom::blink::PermissionService directly to ask permission

content/renderer/render_frame_impl.cc

Index: content/renderer/render_frame_impl.cc
diff --git a/content/renderer/render_frame_impl.cc b/content/renderer/render_frame_impl.cc
index 87b19f037334daf82d1a3a41491a018d61a35eba..db7242bce67a9b0995cde3fe8a29c56a4d2fa453 100644
--- a/content/renderer/render_frame_impl.cc
+++ b/content/renderer/render_frame_impl.cc
@@ -107,6 +107,7 @@
 #include "content/renderer/media/media_permission_dispatcher.h"
 #include "content/renderer/media/media_stream_dispatcher.h"
 #include "content/renderer/media/media_stream_renderer_factory_impl.h"
+#include "content/renderer/media/midi_dispatcher.h"
 #include "content/renderer/media/render_media_log.h"
 #include "content/renderer/media/renderer_webmediaplayer_delegate.h"
 #include "content/renderer/media/user_media_client_impl.h"
@@ -1072,6 +1073,7 @@
       handling_select_range_(false),
       notification_permission_dispatcher_(NULL),
       web_user_media_client_(NULL),
+      midi_dispatcher_(NULL),
 #if defined(OS_ANDROID)
       media_player_manager_(NULL),
       media_session_manager_(NULL),
@@ -4327,6 +4329,12 @@
   return web_encrypted_media_client_.get();
 }
 
+blink::WebMIDIClient* RenderFrameImpl::webMIDIClient() {
+  if (!midi_dispatcher_)
+    midi_dispatcher_ = new MidiDispatcher(this);
+  return midi_dispatcher_;
+}
+
 blink::WebString RenderFrameImpl::userAgentOverride() {
   if (!render_view_->webview() || !render_view_->webview()->mainFrame() ||
       render_view_->renderer_preferences_.user_agent_override.empty()) {