chrome: Cleanup class/struct forward declarations

chrome/browser/plugins/plugin_info_message_filter.h

 // 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.
 
 #ifndef CHROME_BROWSER_PLUGINS_PLUGIN_INFO_MESSAGE_FILTER_H_
 #define CHROME_BROWSER_PLUGINS_PLUGIN_INFO_MESSAGE_FILTER_H_
 
 #include <memory>
 #include <string>
 #include <vector>
 
 #include "base/compiler_specific.h"
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/weak_ptr.h"
 #include "base/sequenced_task_runner_helpers.h"
 #include "chrome/browser/plugins/plugin_prefs.h"
 #include "components/content_settings/core/common/content_settings.h"
 #include "components/prefs/pref_member.h"
 #include "content/public/browser/browser_message_filter.h"
 #include "extensions/features/features.h"
 #include "ppapi/features/features.h"
 
 struct ChromeViewHostMsg_GetPluginInfo_Output;
 enum class ChromeViewHostMsg_GetPluginInfo_Status;
 class GURL;
 class HostContentSettingsMap;
-class PluginFinder;
 class PluginMetadata;
 class Profile;
 
 namespace base {
 class SingleThreadTaskRunner;
 }
 
 namespace content {
 class ResourceContext;
 struct WebPluginInfo;
@@ skipping 109 matching lines @@
 
   Context context_;
 
   scoped_refptr<base::SingleThreadTaskRunner> main_thread_task_runner_;
   base::WeakPtrFactory<PluginInfoMessageFilter> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(PluginInfoMessageFilter);
 };
 
 #endif  // CHROME_BROWSER_PLUGINS_PLUGIN_INFO_MESSAGE_FILTER_H_