refactor EnumerateDevices to make it a persistent request.

webkit/plugins/ppapi/ppb_video_capture_impl.cc

 // 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.
 
 #include "webkit/plugins/ppapi/ppb_video_capture_impl.h"
 
 #include <algorithm>
 #include <string>
 
 #include "base/bind.h"
@@ skipping 294 matching lines @@
 }
 
 void PPB_VideoCapture_Impl::EnumerateDevicesCallbackFunc(
     int request_id,
     bool succeeded,
     const DeviceRefDataVector& devices) {
   devices_data_.clear();
   if (succeeded)
     devices_data_ = devices;
 
+  PluginInstance* instance = ResourceHelper::GetPluginInstance(this);
+  if (instance)
+    instance->delegate()->StopEnumerateDevices(request_id);
+
   OnEnumerateDevicesComplete(succeeded ? PP_OK : PP_ERROR_FAILED, devices);
 }
 
 PPB_VideoCapture_Impl::BufferInfo::BufferInfo()
     : in_use(false),
       data(NULL),
       buffer() {
 }
 
 PPB_VideoCapture_Impl::BufferInfo::~BufferInfo() {
 }
 
 }  // namespace ppapi
 }  // namespace webkit