refactor EnumerateDevices to make it a persistent request.

webkit/plugins/ppapi/mock_plugin_delegate.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/mock_plugin_delegate.h"
 
 #include "base/logging.h"
 #include "base/message_loop_proxy.h"
 #include "ppapi/c/pp_errors.h"
 #include "ppapi/shared_impl/ppapi_preferences.h"
@@ skipping 433 matching lines @@
 bool MockPluginDelegate::IsPageVisible() const {
   return true;
 }
 
 int MockPluginDelegate::EnumerateDevices(
     PP_DeviceType_Dev type,
     const EnumerateDevicesCallback& callback) {
   return -1;
 }
 
+void MockPluginDelegate::StopEnumerateDevices(int request_id) {
+}
+
 webkit_glue::ClipboardClient*
 MockPluginDelegate::CreateClipboardClient() const {
   return NULL;
 }
 
 std::string MockPluginDelegate::GetDeviceID() {
   return std::string();
 }
 
 PP_FlashLSORestrictions MockPluginDelegate::GetLocalDataRestrictions(
     const GURL& document_url,
     const GURL& plugin_url) {
   return PP_FLASHLSORESTRICTIONS_NONE;
 }
 
 }  // namespace ppapi
 }  // namespace webkit