Remove content::NotificationObserver dependency from most Prefs code.

chrome/browser/policy/cloud_policy_subsystem.cc

 // 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.
 
 #include "chrome/browser/policy/cloud_policy_subsystem.h"
 
 #include <algorithm>
 #include <string>
 
 #include "base/command_line.h"
@@ skipping 140 matching lines @@
 
 void CloudPolicySubsystem::UpdatePolicyRefreshRate(int64 refresh_rate) {
   if (cloud_policy_controller_.get()) {
     // Clamp to sane values.
     refresh_rate = std::max(kPolicyRefreshRateMinMs, refresh_rate);
     refresh_rate = std::min(kPolicyRefreshRateMaxMs, refresh_rate);
     cloud_policy_controller_->SetRefreshRate(refresh_rate);
   }
 }
 
-void CloudPolicySubsystem::Observe(
-    int type,
-    const content::NotificationSource& source,
-    const content::NotificationDetails& details) {
-  if (type == chrome::NOTIFICATION_PREF_CHANGED) {
-    DCHECK_EQ(*(content::Details<std::string>(details).ptr()),
-              std::string(refresh_pref_name_));
-    PrefService* local_state = g_browser_process->local_state();
-    DCHECK_EQ(content::Source<PrefService>(source).ptr(), local_state);
-    UpdatePolicyRefreshRate(local_state->GetInteger(refresh_pref_name_));
-  } else {
-    NOTREACHED();
-  }
+void CloudPolicySubsystem::OnPreferenceChanged(PrefServiceBase* service,
+                                               const std::string& pref_name) {
+  DCHECK_EQ(pref_name, refresh_pref_name_);
+  PrefService* local_state = g_browser_process->local_state();
+  DCHECK_EQ(service, local_state);
+  UpdatePolicyRefreshRate(local_state->GetInteger(refresh_pref_name_));
 }
 
 void CloudPolicySubsystem::ScheduleServiceInitialization(
     int64 delay_milliseconds) {
   if (device_management_service_.get())
     device_management_service_->ScheduleInitialization(delay_milliseconds);
 }
 
 
 void CloudPolicySubsystem::CreateDeviceTokenFetcher() {
@@ skipping 17 matching lines @@
 CloudPolicyCacheBase* CloudPolicySubsystem::GetCloudPolicyCacheBase() const {
   return cloud_policy_cache_.get();
 }
 
 CloudPolicySubsystem::CloudPolicySubsystem()
     : refresh_pref_name_(NULL),
       data_store_(NULL) {
 }
 
 }  // namespace policy