Finish moving plugin probing out of process.

chrome/browser/plugin_data_remover.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 CHROME_BROWSER_PLUGIN_DATA_REMOVER_H_
 #define CHROME_BROWSER_PLUGIN_DATA_REMOVER_H_
 #pragma once
 
 #include "base/memory/ref_counted.h"
 #include "base/time.h"
@@ skipping 16 matching lines @@
 
   // The plug-in whose data should be removed (usually Flash) is specified via
   // its MIME type. This method sets a different MIME type in order to call a
   // different plug-in (for example in tests).
   void set_mime_type(const std::string& mime_type) { mime_type_ = mime_type; }
 
   // Starts removing plug-in data stored since |begin_time|.
   base::WaitableEvent* StartRemoving(base::Time begin_time);
 
   // 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.
+  // LSO data. This method will use cached plugin data. Call
+  // PluginService::GetPlugins() if the latest data is needed.
   static bool IsSupported(PluginPrefs* plugin_prefs);
 
   // Indicates whether we are still in the process of removing plug-in data.
   bool is_removing() const { return is_removing_; }
 
   // Wait until removing has finished. When the browser is still running (i.e.
   // not during shutdown), you should use a WaitableEventWatcher in combination
   // with the WaitableEvent returned by StartRemoving.
   void Wait();
 
@@ skipping 38 matching lines @@
   scoped_ptr<base::WaitableEvent> event_;
   // We own the channel, but it's used on the IO thread, so it needs to be
   // deleted there. It's NULL until we have opened a connection to the plug-in
   // process.
   IPC::Channel* channel_;
 
   DISALLOW_COPY_AND_ASSIGN(PluginDataRemover);
 };
 
 #endif  // CHROME_BROWSER_PLUGIN_DATA_REMOVER_H_