support video device enumeration from renderer process.

content/browser/renderer_host/media/media_stream_settings_requester.h

Index: content/browser/renderer_host/media/media_stream_settings_requester.h
===================================================================
--- content/browser/renderer_host/media/media_stream_settings_requester.h	(revision 109718)
+++ content/browser/renderer_host/media/media_stream_settings_requester.h	(working copy)
@@ -15,12 +15,6 @@
 // Implemented by the class requesting media capture device usage.
 class CONTENT_EXPORT SettingsRequester {
  public:
-  // Called to get available devices for a certain media type. A call to
-  // |AvailableDevices| with the currently available capture devices is
-  // expected.
-  virtual void GetDevices(const std::string& label,
-                          MediaStreamType stream_type) = 0;
-
   // If no error occurred, this call will deliver the result and the request
   // is considered answered.
   virtual void DevicesAccepted(const std::string& label,