[WebMIDI] Remove not needed CancelPermission IPC message.

content/browser/media/midi_dispatcher_host.h

Index: content/browser/media/midi_dispatcher_host.h
diff --git a/content/browser/media/midi_dispatcher_host.h b/content/browser/media/midi_dispatcher_host.h
index e1aef2a8c72c4ffd5599c1951fd5de53b4c68c5a..55a3ae5bf0f1cacf3950f4123556f36325d9b12e 100644
--- a/content/browser/media/midi_dispatcher_host.h
+++ b/content/browser/media/midi_dispatcher_host.h
@@ -22,6 +22,10 @@ class MidiDispatcherHost : public WebContentsObserver {
   virtual ~MidiDispatcherHost();
 
   // WebContentsObserver implementation.
+  virtual void RenderFrameDeleted(RenderFrameHost* render_frame_host) override;
+  virtual void DidNavigateAnyFrame(RenderFrameHost* render_frame_host,
+                                   const LoadCommittedDetails& details,
+                                   const FrameNavigateParams& params) override;
   virtual bool OnMessageReceived(const IPC::Message& message,
                                  RenderFrameHost* render_frame_host) override;
 
@@ -37,6 +41,7 @@ class MidiDispatcherHost : public WebContentsObserver {
                                  int render_frame_id,
                                  int bridge_id,
                                  bool is_allowed);
+  void CancelPermissionRequestsForFrame(RenderFrameHost* render_frame_host);
 
   struct PendingPermission {
     PendingPermission(int render_process_id,