Remove PrefObserver usage, batch 3.

chrome/browser/content_settings/content_settings_pref_provider.h

 // Copyright (c) 2012 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_
 
 // A content settings provider that takes its settings out of the pref service.
 
 #include <vector>
 
 #include "base/basictypes.h"
 #include "base/prefs/public/pref_change_registrar.h"
-#include "base/prefs/public/pref_observer.h"
 #include "base/synchronization/lock.h"
 #include "chrome/browser/content_settings/content_settings_observable_provider.h"
 #include "chrome/browser/content_settings/content_settings_origin_identifier_value_map.h"
 #include "chrome/browser/content_settings/content_settings_utils.h"
 
 class PrefService;
 
 namespace base {
 class DictionaryValue;
 }
 
 namespace content_settings {
 
 // Content settings provider that provides content settings from the user
 // preference.
-class PrefProvider : public ObservableProvider,
-                     public PrefObserver {
+class PrefProvider : public ObservableProvider {
  public:
   static void RegisterUserPrefs(PrefService* prefs);
 
   PrefProvider(PrefService* prefs,
                bool incognito);
   virtual ~PrefProvider();
 
   // ProviderInterface implementations.
   virtual RuleIterator* GetRuleIterator(
       ContentSettingsType content_type,
       const ResourceIdentifier& resource_identifier,
       bool incognito) const OVERRIDE;
 
   virtual bool SetWebsiteSetting(
       const ContentSettingsPattern& primary_pattern,
       const ContentSettingsPattern& secondary_pattern,
       ContentSettingsType content_type,
       const ResourceIdentifier& resource_identifier,
       Value* value) OVERRIDE;
 
   virtual void ClearAllContentSettingsRules(
       ContentSettingsType content_type) OVERRIDE;
 
   virtual void ShutdownOnUIThread() OVERRIDE;
 
-  // PrefObserver implementation.
-  virtual void OnPreferenceChanged(PrefServiceBase* service,
-                                   const std::string& pref_name) OVERRIDE;
-
  private:
   friend class DeadlockCheckerThread;  // For testing.
   // Reads all content settings exceptions from the preference and load them
   // into the |value_map_|. The |value_map_| is cleared first if |overwrite| is
   // true.
   void ReadContentSettingsFromPref(bool overwrite);
 
+  // Callback for changes in the pref with the same name.
+  void OnContentSettingsPatternPairsChanged();
+
   // Update the preference that stores content settings exceptions and syncs the
   // value to the obsolete preference. When calling this function, |lock_|
   // should not be held, since this function will send out notifications of
   // preference changes.
   void UpdatePref(
       const ContentSettingsPattern& primary_pattern,
       const ContentSettingsPattern& secondary_pattern,
       ContentSettingsType content_type,
       const ResourceIdentifier& resource_identifier,
       const base::Value* value);
@@ skipping 37 matching lines @@
 
   // 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_