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

content/renderer/render_frame_impl.h

Index: content/renderer/render_frame_impl.h
diff --git a/content/renderer/render_frame_impl.h b/content/renderer/render_frame_impl.h
index 56bc147f78e0671c4f1a3f1724e0f9e739cddacc..2ff0dd716f7a2455c55fe998ececc2dabd200182 100644
--- a/content/renderer/render_frame_impl.h
+++ b/content/renderer/render_frame_impl.h
@@ -606,6 +606,7 @@
       blink::WebRTCPeerConnectionHandler* handler) override;
   blink::WebUserMediaClient* userMediaClient() override;
   blink::WebEncryptedMediaClient* encryptedMediaClient() override;
+  blink::WebMIDIClient* webMIDIClient() override;
   blink::WebString userAgentOverride() override;
   blink::WebString doNotTrackValue() override;
   bool allowWebGL(bool default_value) override;
@@ -1174,6 +1175,9 @@
   std::unique_ptr<MediaInterfaceProvider> media_interface_provider_;
 #endif
 
+  // MidiClient attached to this frame; lazily initialized.
+  MidiDispatcher* midi_dispatcher_;
+
 #if defined(OS_ANDROID)
   // Manages all media players and sessions in this render frame for
   // communicating with the real media player and sessions in the