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

chrome/browser/plugin_data_remover.h

Index: chrome/browser/plugin_data_remover.h
diff --git a/chrome/browser/plugin_data_remover.h b/chrome/browser/plugin_data_remover.h
index cbc255678aeac711efbf95dc7f7251ec00185cc2..7d76d32e64757c62636c8279a6daa1a16625174f 100644
--- a/chrome/browser/plugin_data_remover.h
+++ b/chrome/browser/plugin_data_remover.h
@@ -39,6 +39,11 @@ class PluginDataRemover : public PluginProcessHost::Client,
   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();
@@ -52,6 +57,7 @@ class PluginDataRemover : public PluginProcessHost::Client,
   // deleted there as well.
   IPC::Channel* channel_;
   ScopedRunnableMethodFactory<PluginDataRemover> method_factory_;
+  Lock task_lock_;
 };
 
 #endif  // CHROME_BROWSER_PLUGIN_DATA_REMOVER_H_