Remove content::NotificationObserver dependency from most Prefs code.

chrome/browser/policy/cloud_policy_refresh_scheduler.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_POLICY_CLOUD_POLICY_REFRESH_SCHEDULER_H_
 #define CHROME_BROWSER_POLICY_CLOUD_POLICY_REFRESH_SCHEDULER_H_
 
 #include <string>
 
 #include "base/basictypes.h"
 #include "base/cancelable_callback.h"
 #include "base/memory/ref_counted.h"
+#include "base/prefs/public/pref_observer.h"
 #include "base/time.h"
 #include "chrome/browser/api/prefs/pref_member.h"
 #include "chrome/browser/policy/cloud_policy_client.h"
 #include "chrome/browser/policy/cloud_policy_store.h"
-#include "content/public/browser/notification_observer.h"
 #include "net/base/network_change_notifier.h"
 
 class PrefService;
 
 namespace base {
 class TaskRunner;
 }
 
 namespace policy {
 
 // Observes CloudPolicyClient and CloudPolicyStore to trigger periodic policy
 // fetches and issue retries on error conditions.
 class CloudPolicyRefreshScheduler
     : public CloudPolicyClient::Observer,
       public CloudPolicyStore::Observer,
-      public content::NotificationObserver,
+      public PrefObserver,
       public net::NetworkChangeNotifier::IPAddressObserver {
  public:
   // Refresh constants.
   static const int64 kUnmanagedRefreshDelayMs;
   static const int64 kInitialErrorRetryDelayMs;
 
   // Refresh delay bounds.
   static const int64 kRefreshDelayMinMs;
   static const int64 kRefreshDelayMaxMs;
 
   // |client|, |store| and |prefs| pointers must stay valid throughout the
   // lifetime of CloudPolicyRefreshScheduler.
   CloudPolicyRefreshScheduler(
       CloudPolicyClient* client,
       CloudPolicyStore* store,
       PrefService* prefs,
       const std::string& refresh_pref,
       const scoped_refptr<base::TaskRunner>& task_runner);
   virtual ~CloudPolicyRefreshScheduler();
 
   // CloudPolicyClient::Observer:
   virtual void OnPolicyFetched(CloudPolicyClient* client) OVERRIDE;
   virtual void OnRegistrationStateChanged(CloudPolicyClient* client) OVERRIDE;
   virtual void OnClientError(CloudPolicyClient* client) OVERRIDE;
 
   // CloudPolicyStore::Observer:
   virtual void OnStoreLoaded(CloudPolicyStore* store) OVERRIDE;
   virtual void OnStoreError(CloudPolicyStore* store) OVERRIDE;
 
-  // content::NotificationObserver:
-  virtual void Observe(int type,
-                       const content::NotificationSource& source,
-                       const content::NotificationDetails& details) OVERRIDE;
+  // PrefObserver:
+  virtual void OnPreferenceChanged(PrefServiceBase* service,
+                                   const std::string& pref_name) OVERRIDE;
 
   // net::NetworkChangeNotifier::IPAddressObserver:
   virtual void OnIPAddressChanged() OVERRIDE;
 
  private:
   // Initializes |last_refresh_| to the policy timestamp from |store_| in case
   // there is policy present that indicates this client is not managed. This
   // results in policy fetches only to occur after the entire unmanaged refresh
   // delay expires, even over restarts. For managed clients, we want to trigger
   // a refresh on every restart.
@@ skipping 29 matching lines @@
   int64 error_retry_delay_ms_;
 
   IntegerPrefMember refresh_delay_;
 
   DISALLOW_COPY_AND_ASSIGN(CloudPolicyRefreshScheduler);
 };
 
 }  // namespace policy
 
 #endif  // CHROME_BROWSER_POLICY_CLOUD_POLICY_REFRESH_SCHEDULER_H_