Explicitly ShutdownOnUIThread the HostContentSettingsMap when destroying the Profile.

chrome/browser/content_settings/content_settings_pref_provider.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_CONTENT_SETTINGS_CONTENT_SETTINGS_PREF_PROVIDER_H_
 #define CHROME_BROWSER_CONTENT_SETTINGS_CONTENT_SETTINGS_PREF_PROVIDER_H_
 #pragma once
 
 // A content settings provider that takes its settings out of the pref service.
 
 #include <map>
 #include <string>
 #include <utility>
 
 #include "base/basictypes.h"
 #include "base/synchronization/lock.h"
 #include "chrome/browser/content_settings/content_settings_origin_identifier_value_map.h"
 #include "chrome/browser/content_settings/content_settings_provider.h"
 #include "chrome/browser/content_settings/content_settings_utils.h"
 #include "chrome/browser/prefs/pref_change_registrar.h"
 #include "content/common/notification_observer.h"
 #include "content/common/notification_registrar.h"
 
 class ContentSettingsDetails;
 class DictionaryValue;
+class HostContentSettingsMap;
 class PrefService;
-class Profile;
 
 namespace content_settings {
 
 // Content settings provider that provides default content settings based on
 // user prefs.
 class PrefDefaultProvider : public DefaultProviderInterface,
                             public NotificationObserver {
  public:
-  explicit PrefDefaultProvider(Profile* profile);
+  PrefDefaultProvider(HostContentSettingsMap* map,
+                      PrefService* prefs,
+                      bool incognito);
   virtual ~PrefDefaultProvider();
 
   // DefaultContentSettingsProvider implementation.
   virtual ContentSetting ProvideDefaultSetting(
       ContentSettingsType content_type) const;
   virtual void UpdateDefaultSetting(ContentSettingsType content_type,
                                     ContentSetting setting);
   virtual bool DefaultSettingIsManaged(ContentSettingsType content_type) const;
 
+  void ShutdownOnUIThread();
+
   static void RegisterUserPrefs(PrefService* prefs);
 
   // NotificationObserver implementation.
   virtual void Observe(NotificationType type,
                        const NotificationSource& source,
                        const NotificationDetails& details);
 
  private:
   // Informs observers that content settings have changed. Make sure that
   // |lock_| is not held when calling this, as listeners will usually call one
   // of the GetSettings functions in response, which would then lead to a
   // mutex deadlock.
   void NotifyObservers(const ContentSettingsDetails& details);
 
-  void UnregisterObservers();
-
   // Sets the fields of |settings| based on the values in |dictionary|.
   void GetSettingsFromDictionary(const DictionaryValue* dictionary,
                                  ContentSettings* settings);
 
   // Forces the default settings to be explicitly set instead of themselves
   // being CONTENT_SETTING_DEFAULT.
   void ForceDefaultsToBeExplicit();
 
   // Reads the default settings from the preferences service. If |overwrite| is
   // true and the preference is missing, the local copy will be cleared as well.
   void ReadDefaultSettings(bool overwrite);
 
-  void MigrateObsoleteNotificationPref(PrefService* prefs);
+  void MigrateObsoleteNotificationPref();
 
   // Copies of the pref data, so that we can read it on the IO thread.
   ContentSettings default_content_settings_;
 
-  Profile* profile_;
+  HostContentSettingsMap* host_content_settings_map_;
+  PrefService* prefs_;
 
   // Whether this settings map is for an Incognito session.
   bool is_incognito_;
 
   // Used around accesses to the default_content_settings_ object to guarantee
   // thread safety.
   mutable base::Lock lock_;
 
   PrefChangeRegistrar pref_change_registrar_;
-  NotificationRegistrar notification_registrar_;
 
   // Whether we are currently updating preferences, this is used to ignore
   // notifications from the preferences service that we triggered ourself.
   bool updating_preferences_;
 
-  bool initializing_;
-
   DISALLOW_COPY_AND_ASSIGN(PrefDefaultProvider);
 };
 
 // Content settings provider that provides content settings from the user
 // preference.
 class PrefProvider : public ProviderInterface,
                      public NotificationObserver {
  public:
   static void RegisterUserPrefs(PrefService* prefs);
 
-  explicit PrefProvider(Profile* profile);
+  PrefProvider(HostContentSettingsMap* map,
+               PrefService* prefs,
+               bool incognito);
   virtual ~PrefProvider();
 
   // ProviderInterface implementations.
   virtual void SetContentSetting(
       const ContentSettingsPattern& primary_pattern,
       const ContentSettingsPattern& secondary_pattern,
       ContentSettingsType content_type,
       const ResourceIdentifier& resource_identifier,
       ContentSetting content_setting);
 
   virtual ContentSetting GetContentSetting(
       const GURL& primary_url,
       const GURL& secondary_url,
       ContentSettingsType content_type,
       const ResourceIdentifier& resource_identifier) const;
 
   virtual void GetAllContentSettingsRules(
       ContentSettingsType content_type,
       const ResourceIdentifier& resource_identifier,
       Rules* content_setting_rules) const;
 
   virtual void ClearAllContentSettingsRules(
       ContentSettingsType content_type);
 
+  virtual void ShutdownOnUIThread();
+
   // NotificationObserver implementation.
   virtual void Observe(NotificationType type,
                        const NotificationSource& source,
                        const NotificationDetails& details);
 
  private:
   void Init();
 
   // Reads all content settings exceptions from the preference and load them
   // into the |value_map_|. The |value_map_| is cleared first if |overwrite| is
@@ skipping 23 matching lines @@
   // is obsolete and only used for compatibility reasons.
   void UpdatePatternsPref(
       const ContentSettingsPattern& primary_pattern,
       const ContentSettingsPattern& secondary_pattern,
       ContentSettingsType content_type,
       const ResourceIdentifier& resource_identifier,
       ContentSetting setting);
 
   // Various migration methods (old cookie, popup and per-host data gets
   // migrated to the new format).
-  void MigrateObsoletePerhostPref(PrefService* prefs);
-  void MigrateObsoletePopupsPref(PrefService* prefs);
-  void MigrateObsoleteContentSettingsPatternPref(PrefService* prefs);
+  void MigrateObsoletePerhostPref();
+  void MigrateObsoletePopupsPref();
+  void MigrateObsoleteContentSettingsPatternPref();
 
   // Copies the value of the preference that stores the content settings
   // exceptions to the obsolete preference for content settings exceptions. This
   // is necessary to allow content settings exceptions beeing synced to older
   // versions of chrome that only use the obsolete.
-  void SyncObsoletePref(PrefService* pref);
+  void SyncObsoletePref();
 
-  void CanonicalizeContentSettingsExceptions(
+  static void CanonicalizeContentSettingsExceptions(
       DictionaryValue* all_settings_dictionary);
 
   void NotifyObservers(const ContentSettingsDetails& details);
 
-  void UnregisterObservers();
+  // Weak; owned by the Profile and reset in ShutdownOnUIThread.
+  PrefService* prefs_;
 
-  Profile* profile_;
+  // Weak; owns us
+  HostContentSettingsMap* host_content_settings_map_;
 
   bool is_incognito_;
 
   PrefChangeRegistrar pref_change_registrar_;
-  NotificationRegistrar notification_registrar_;
 
   // Whether we are currently updating preferences, this is used to ignore
   // notifications from the preferences service that we triggered ourself.
   bool updating_preferences_;
 
-  // Do not fire any Notifications as long as we are in the constructor.
-  bool initializing_;
-
   OriginIdentifierValueMap value_map_;
 
   OriginIdentifierValueMap incognito_value_map_;
 
   // Used around accesses to the value map objects to guarantee
   // thread safety.
   mutable base::Lock lock_;
 
   DISALLOW_COPY_AND_ASSIGN(PrefProvider);
 };
 
 }  // namespace content_settings
 
 #endif  // CHROME_BROWSER_CONTENT_SETTINGS_CONTENT_SETTINGS_PREF_PROVIDER_H_