Remove content::NotificationObserver dependency from most Prefs code.

chrome/browser/sync/credential_cache_service_win.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_SYNC_CREDENTIAL_CACHE_SERVICE_WIN_H_
 #define CHROME_BROWSER_SYNC_CREDENTIAL_CACHE_SERVICE_WIN_H_
 
 #include <string>
 
 #include "base/basictypes.h"
 #include "base/cancelable_callback.h"
 #include "base/file_path.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/weak_ptr.h"
 #include "base/prefs/json_pref_store.h"
 #include "base/prefs/public/pref_change_registrar.h"
+#include "base/prefs/public/pref_observer.h"
 #include "chrome/browser/profiles/profile_keyed_service.h"
 #include "chrome/browser/sync/sync_prefs.h"
 #include "content/public/browser/notification_observer.h"
 #include "content/public/browser/notification_registrar.h"
 
 namespace base {
 class StringValue;
 class Value;
 }
 
 class Profile;
 
 namespace syncer {
 
 // On Windows 8, Chrome must maintain separate profile directories for Metro and
 // Desktop modes. When the user signs in to sync in one of the modes, we would
 // like to automatically start sync in the other mode.
 //
 // This class implements a caching service for sync credentials. It listens for
 // updates to the PrefService and TokenService that pertain to the user
 // signing in and out of sync, and persists the credentials to a separate file
 // in the default profile directory. It also contains functionality to bootstrap
 // sync using credentials that were cached due to signing in on the other
 // (alternate) mode.
 class CredentialCacheService : public ProfileKeyedService,
-                               public content::NotificationObserver {
+                               public content::NotificationObserver,
+                               public PrefObserver {
  public:
   explicit CredentialCacheService(Profile* profile);
   virtual ~CredentialCacheService();
 
   // ProfileKeyedService implementation.
   virtual void Shutdown() OVERRIDE;
 
   // content::NotificationObserver implementation.
   virtual void Observe(int type,
                        const content::NotificationSource& source,
                        const content::NotificationDetails& details) OVERRIDE;
 
+  // PrefObserver implementation.
+  virtual void OnPreferenceChanged(PrefServiceBase* service,
+                                   const std::string& pref_name) OVERRIDE;
+
   // Loads cached sync credentials from the alternate profile and applies them
   // to the local profile if the load was successful.
   void ReadCachedCredentialsFromAlternateProfile();
 
   // Writes kSyncKeepEverythingSynced and the sync preferences for individual
   // datatypes to the local cache.
   void WriteSyncPrefsToLocalCache();
 
   // Resets |alternate_store_| and schedules the next read from the alternate
   // credential cache in |delay_secs| seconds.
@@ skipping 245 matching lines @@
   // Used to make sure that there is always at most one future read scheduled
   // on the alternate credential cache.
   base::CancelableClosure next_read_;
 
   DISALLOW_COPY_AND_ASSIGN(CredentialCacheService);
 };
 
 }  // namespace syncer
 
 #endif  // CHROME_BROWSER_SYNC_CREDENTIAL_CACHE_SERVICE_WIN_H_