[WebMIDI] Remove not needed CancelPermission IPC message.

content/browser/media/midi_dispatcher_host.h

 // 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_BROWSER_MEDIA_MIDI_DISPATCHER_HOST_H_
 #define CONTENT_BROWSER_MEDIA_MIDI_DISPATCHER_HOST_H_
 
 #include <vector>
 
 #include "base/callback_forward.h"
 #include "base/memory/weak_ptr.h"
 #include "content/public/browser/web_contents_observer.h"
 
 namespace content {
 
 class BrowserContext;
 
 // MidiDispatcherHost handles permissions for using system exclusive messages.
 class MidiDispatcherHost : public WebContentsObserver {
  public:
   explicit MidiDispatcherHost(WebContents* web_contents);
   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;
 
  private:
   void OnRequestSysExPermission(RenderFrameHost* render_frame_host,
                                 int bridge_id,
                                 const GURL& origin,
                                 bool user_gesture);
   void OnCancelSysExPermissionRequest(RenderFrameHost* render_frame_host,
                                       int bridge_id,
                                       const GURL& requesting_frame);
   void WasSysExPermissionGranted(int render_process_id,
                                  int render_frame_id,
                                  int bridge_id,
                                  bool is_allowed);
+  void CancelPermissionRequestsForFrame(RenderFrameHost* render_frame_host);
 
   struct PendingPermission {
     PendingPermission(int render_process_id,
                       int render_frame_id,
                       int bridge_id);
     ~PendingPermission();
     int render_process_id;
     int render_frame_id;
     int bridge_id;
     base::Closure cancel;
   };
   std::vector<PendingPermission> pending_permissions_;
 
   base::WeakPtrFactory<MidiDispatcherHost> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(MidiDispatcherHost);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_MEDIA_MIDI_DISPATCHER_HOST_H_