Add a preference to clear Flash LSO data in the Clear Browsing Data dialog.

chrome/browser/plugin_data_remover.h

 // 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.
 
 #ifndef CHROME_BROWSER_PLUGIN_DATA_REMOVER_H_
 #define CHROME_BROWSER_PLUGIN_DATA_REMOVER_H_
 #pragma once
 
 #include "base/ref_counted.h"
 #include "base/time.h"
@@ skipping 21 matching lines @@
   virtual int ID();
   virtual bool OffTheRecord();
   virtual void SetPluginInfo(const WebPluginInfo& info);
   virtual void OnChannelOpened(const IPC::ChannelHandle& handle);
   virtual void OnError();
 
   // IPC::ChannelProxy::MessageFilter methods
   virtual void OnMessageReceived(const IPC::Message& message);
   virtual void OnChannelError();
 
+  // Returns whether there is a plug-in installed that supports removing
+  // LSO data. Because this method possibly has to load the plug-in list, it
+  // should only be called on the FILE thread.
+  static bool IsSupported();
+
  private:
   void SignalDone();
   void SignalError();
   void OnClearSiteDataResult(bool success);
   void OnTimeout();
 
   scoped_refptr<base::MessageLoopProxy> message_loop_;
   scoped_ptr<Task> done_task_;
   base::Time begin_time_;
   // We own the channel, but it's used on the IO thread, so it needs to be
   // deleted there as well.
   IPC::Channel* channel_;
   ScopedRunnableMethodFactory<PluginDataRemover> method_factory_;
+  Lock task_lock_;
 };
 
 #endif  // CHROME_BROWSER_PLUGIN_DATA_REMOVER_H_