support video device enumeration from renderer process.

content/browser/renderer_host/media/media_stream_device_settings.cc

 // Copyright (c) 2011 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.
 
 #include "content/browser/renderer_host/media/media_stream_device_settings.h"
 
 #include "base/stl_util.h"
 #include "content/browser/renderer_host/media/media_stream_settings_requester.h"
 #include "content/common/media/media_stream_options.h"
 #include "content/public/browser/browser_thread.h"
@@ skipping 48 matching lines @@
     // Request with this id already exists.
     requester_->SettingsError(label);
     return;
   }
 
   // Create a new request.
   requests_.insert(std::make_pair(label, new SettingsRequest(render_process_id,
                                                              render_view_id,
                                                              security_origin,
                                                              request_options)));
-  // Ask for available devices.
-  if (request_options.audio) {
-    requester_->GetDevices(label, kAudioCapture);
-  }
-  if (request_options.video_option != StreamOptions::kNoCamera) {
-    requester_->GetDevices(label, kVideoCapture);
-  }
 }
 
 void MediaStreamDeviceSettings::AvailableDevices(
     const std::string& label, MediaStreamType stream_type,
     const StreamDeviceInfoArray& devices) {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
 
   SettingsRequests::iterator request_it = requests_.find(label);
   if (request_it == requests_.end()) {
     // Request with this id doesn't exist.
@@ skipping 54 matching lines @@
     }
   }
 }
 
 void MediaStreamDeviceSettings::UseFakeUI() {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
   use_fake_ui_ = true;
 }
 
 }  // namespace media_stream