Cleanup: Remove unneeded forward declarations in webkit/plugins/.

webkit/plugins/npapi/plugin_group.h

 // 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.
 
 #ifndef WEBKIT_PLUGINS_NPAPI_PLUGIN_GROUP_H_
 #define WEBKIT_PLUGINS_NPAPI_PLUGIN_GROUP_H_
 #pragma once
 
 #include <string>
 #include <vector>
 
 #include "base/gtest_prod_util.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/string16.h"
 #include "webkit/plugins/webplugininfo.h"
 
 class FilePath;
 class PluginExceptionsTableModelTest;
 class Version;
 
-namespace base {
-class DictionaryValue;
-}
-
 namespace webkit {
 namespace npapi {
 
 class PluginList;
 class MockPluginList;
 
 // Hard-coded version ranges for plugin groups.
 struct VersionRangeDefinition {
   // Matcher for lowest version matched by this range (inclusive). May be empty
   // to match everything iff |version_matcher_high| is also empty.
@@ skipping 160 matching lines @@
   string16 name_matcher_;
   std::string update_url_;
   std::vector<VersionRange> version_ranges_;
   std::vector<webkit::WebPluginInfo> web_plugin_infos_;
 };
 
 }  // namespace npapi
 }  // namespace webkit
 
 #endif  // WEBKIT_PLUGINS_NPAPI_PLUGIN_GROUP_H_