Implement CancelUserMediaRequest for the browser part

content/browser/renderer_host/media/media_stream_device_settings.h

 // Copyright (c) 2012 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.
 
 // MediaStreamDeviceSettings is used to decide which of the available capture
 // device to use as well as getting user permission to use the capture device.
 // There will be one instance of MediaStreamDeviceSettings handling all
 // requests.
 
 // Expected call flow:
@@ skipping 27 matching lines @@
   explicit MediaStreamDeviceSettings(SettingsRequester* requester);
   virtual ~MediaStreamDeviceSettings();
 
   // Called when a new request of capture device usage is made.
   void RequestCaptureDeviceUsage(const std::string& label,
                                  int render_process_id,
                                  int render_view_id,
                                  const StreamOptions& stream_components,
                                  const GURL& security_origin);
 
+  // Called to remove a pending request of capture device usage when the user
+  // has no action for the media stream InfoBar.
+  void RemovePendingCaptureRequest(const std::string& label);
+
   // Called to pass in an array of available devices for a request represented
   // by |label|. There could be multiple calls for a request.
   void AvailableDevices(const std::string& label, MediaStreamType stream_type,
                         const StreamDeviceInfoArray& devices);
 
   // Called by the InfoBar when the user grants/denies access to some devices
   // to the webpage. This is placed here, so the request can be cleared from the
   // list of pending requests, instead of letting the InfoBar itself respond to
   // the requester. An empty list of devices means that access has been denied.
   // This method must be called on the IO thread.
@@ skipping 25 matching lines @@
 
   // See comment above for method UseFakeUI. Used for automated testing.
   bool use_fake_ui_;
 
   DISALLOW_COPY_AND_ASSIGN(MediaStreamDeviceSettings);
 };
 
 }  // namespace media_stream
 
 #endif  // CONTENT_BROWSER_RENDERER_HOST_MEDIA_MEDIA_STREAM_DEVICE_SETTINGS_H_