Convert the PluginService interface to be an async wrapper around PluginList.

chrome/browser/mock_plugin_exceptions_table_model.cc

 // Copyright (c) 2010 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 "chrome/browser/mock_plugin_exceptions_table_model.h"
 
+#include "webkit/plugins/npapi/plugin_group.h"
+
 MockPluginExceptionsTableModel::MockPluginExceptionsTableModel(
     HostContentSettingsMap* map,
     HostContentSettingsMap* otr_map)
     : PluginExceptionsTableModel(map, otr_map) {}
 
 MockPluginExceptionsTableModel::~MockPluginExceptionsTableModel() {}
 
 void MockPluginExceptionsTableModel::set_plugins(
     std::vector<webkit::npapi::PluginGroup>& plugins) {
   plugins_ = plugins;
 }
 
 void MockPluginExceptionsTableModel::GetPlugins(
     std::vector<webkit::npapi::PluginGroup>* plugin_groups) {
   *plugin_groups = plugins_;
 }