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

content/renderer/media/midi_dispatcher.h

Index: content/renderer/media/midi_dispatcher.h
diff --git a/content/renderer/media/midi_dispatcher.h b/content/renderer/media/midi_dispatcher.h
new file mode 100644
index 0000000000000000000000000000000000000000..2d98117d092771a4742b5fcdaa2912c9fb7be455
--- /dev/null
+++ b/content/renderer/media/midi_dispatcher.h
@@ -0,0 +1,56 @@
+// Copyright 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.
+
+#ifndef CONTENT_RENDERER_MEDIA_MIDI_DISPATCHER_H_
+#define CONTENT_RENDERER_MEDIA_MIDI_DISPATCHER_H_
+
+#include "base/id_map.h"
+#include "base/macros.h"
+#include "content/public/renderer/render_frame_observer.h"
+#include "third_party/WebKit/public/platform/modules/permissions/permission.mojom.h"
+#include "third_party/WebKit/public/web/modules/webmidi/WebMIDIClient.h"
+
+namespace blink {
+class WebMIDIPermissionRequest;
+}
+
+namespace content {
+
+// MidiDispatcher implements WebMIDIClient to handle permissions for using
+// system exclusive messages.
+// It works as RenderFrameObserver to keep a 1:1 relationship with a RenderFrame
+// and make sure it has the same life cycle.
+class MidiDispatcher : public RenderFrameObserver,
+                       public blink::WebMIDIClient {
+ public:
+  explicit MidiDispatcher(RenderFrame* render_frame);
+  ~MidiDispatcher() override;
+
+ private:
+  // RenderFrameObserver implementation.
+  void OnDestruct() override;
+
+  // blink::WebMIDIClient implementation.
+  void requestPermission(const blink::WebMIDIPermissionRequest& request,
+                         const blink::WebMIDIOptions& options) override;
+  void cancelPermissionRequest(
+      const blink::WebMIDIPermissionRequest& request) override;
+
+  // Permission for using MIDI system has been set.
+  void OnPermissionSet(int request_id, blink::mojom::PermissionStatus status);
+
+  // Each WebMIDIPermissionRequest object is valid until
+  // cancelSysexPermissionRequest() is called with the object, or used to call
+  // WebMIDIPermissionRequest::setIsAllowed().
+  typedef IDMap<blink::WebMIDIPermissionRequest, IDMapOwnPointer> Requests;
+  Requests requests_;
+
+  blink::mojom::PermissionServicePtr permission_service_;
+
+  DISALLOW_COPY_AND_ASSIGN(MidiDispatcher);
+};
+
+}  // namespace content
+
+#endif  // CONTENT_RENDERER_MEDIA_MIDI_DISPATCHER_H_