Revert r96364, it's breaking a NaCl test.

chrome/browser/plugin_updater.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_PREFS_H_
-#define CHROME_BROWSER_PLUGIN_PREFS_H_
+#ifndef CHROME_BROWSER_PLUGIN_UPDATER_H_
+#define CHROME_BROWSER_PLUGIN_UPDATER_H_
 #pragma once
 
 #include <set>
 #include <vector>
 
 #include "base/basictypes.h"
 #include "base/file_path.h"
-#include "base/memory/ref_counted.h"
+#include "base/memory/singleton.h"
 #include "chrome/browser/prefs/pref_change_registrar.h"
 #include "content/common/notification_observer.h"
 
 class NotificationDetails;
 class NotificationSource;
 class Profile;
 
-namespace content {
-class ResourceContext;
-}
-
 namespace base {
 class DictionaryValue;
 class ListValue;
 }
 
 namespace webkit {
 namespace npapi {
 class PluginGroup;
 struct WebPluginInfo;
 }
 }
 
-// This class stores information about whether a plug-in or a plug-in group is
-// enabled or disabled.
-// Except for the |IsPluginEnabled| method, it should only be used on the UI
-// thread.
-class PluginPrefs : public base::RefCountedThreadSafe<PluginPrefs>,
-                    public NotificationObserver {
+class PluginUpdater : public NotificationObserver {
  public:
-  // Initializes the factory for this class for dependency tracking.
-  // This should be called before the first profile is created.
-  static void Initialize();
-
-  static PluginPrefs* GetForProfile(Profile* profile);
+  // Get a list of all the plugin groups. The caller should take ownership
+  // of the returned ListValue.
+  static base::ListValue* GetPluginGroupsData();
 
   // Enable or disable a plugin group.
   void EnablePluginGroup(bool enable, const string16& group_name);
 
   // Enable or disable a specific plugin file.
-  void EnablePlugin(bool enable, const FilePath& file_path);
+  void EnablePlugin(bool enable, const FilePath::StringType& file_path);
 
-  // Returns whether the plugin is enabled or not.
-  bool IsPluginEnabled(const webkit::npapi::WebPluginInfo& plugin);
+  // Associates the PluginUpdater with |profile|. This enables or disables
+  // plugin groups as defined by the user's preferences.
+  void SetProfile(Profile* profile);
+
+  // Called at shutdown before the profile is destroyed.
+  void Shutdown();
 
   // Write the enable/disable status to the user's preference file.
-  void UpdatePreferences(int delay_ms);
+  void UpdatePreferences(Profile* profile, int delay_ms);
 
   // NotificationObserver method overrides
   virtual void Observe(int type,
                        const NotificationSource& source,
                        const NotificationDetails& details);
 
+  static PluginUpdater* GetInstance();
+
   static void RegisterPrefs(PrefService* prefs);
 
-  void ShutdownOnUIThread();
-
  private:
-  friend class base::RefCountedThreadSafe<PluginPrefs>;
-
-  class Factory;
-
-  PluginPrefs();
-  virtual ~PluginPrefs();
-
-  // Associates the PluginPrefs with |profile|. This enables or disables
-  // plugin groups as defined by the user's preferences.
-  void SetProfile(Profile* profile);
+  PluginUpdater();
+  virtual ~PluginUpdater() {}
 
   // Called on the file thread to get the data necessary to update the saved
-  // preferences.
-  void GetPreferencesDataOnFileThread();
+  // preferences.  The profile pointer is only to be passed to the UI thread.
+  static void GetPreferencesDataOnFileThread(void* profile);
 
   // Called on the UI thread with the plugin data to save the preferences.
-  void OnUpdatePreferences(std::vector<webkit::npapi::WebPluginInfo> plugins,
-                           std::vector<webkit::npapi::PluginGroup> groups);
+  static void OnUpdatePreferences(
+      Profile* profile,
+      const std::vector<webkit::npapi::WebPluginInfo>& plugins,
+      const std::vector<webkit::npapi::PluginGroup>& groups);
 
   // Queues sending the notification that plugin data has changed.  This is done
   // so that if a bunch of changes happen, we only send one notification.
   void NotifyPluginStatusChanged();
 
   // Used for the post task to notify that plugin enabled status changed.
-  void OnNotifyPluginStatusChanged();
+  static void OnNotifyPluginStatusChanged();
 
-  base::DictionaryValue* CreatePluginFileSummary(
+  static base::DictionaryValue* CreatePluginFileSummary(
       const webkit::npapi::WebPluginInfo& plugin);
 
   // Force plugins to be enabled or disabled due to policy.
   // |disabled_list| contains the list of StringValues of the names of the
   // policy-disabled plugins, |exceptions_list| the policy-allowed plugins,
   // and |enabled_list| the policy-enabled plugins.
   void UpdatePluginsStateFromPolicy(const base::ListValue* disabled_list,
                                     const base::ListValue* exceptions_list,
                                     const base::ListValue* enabled_list);
 
   void ListValueToStringSet(const base::ListValue* src,
                             std::set<string16>* dest);
 
-  // Weak pointer, owned by the profile.
-  PrefService* prefs_;
+  // Needed to allow singleton instantiation using private constructor.
+  friend struct DefaultSingletonTraits<PluginUpdater>;
 
   PrefChangeRegistrar registrar_;
 
   bool notify_pending_;
 
-  DISALLOW_COPY_AND_ASSIGN(PluginPrefs);
+  DISALLOW_COPY_AND_ASSIGN(PluginUpdater);
 };
 
-#endif  // CHROME_BROWSER_PLUGIN_PREFS_H_
+#endif  // CHROME_BROWSER_PLUGIN_UPDATER_H_