Remove content::NotificationObserver dependency from most Prefs code.

chrome/browser/autofill/autofill_manager.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/autofill/autofill_manager.h"
 
 #include <stddef.h>
 
 #include <limits>
 #include <map>
@@ skipping 272 matching lines @@
       new_renderer) {
     password_generation_enabled_ = new_password_generation_enabled;
     SendPasswordGenerationStateToRenderer(host, password_generation_enabled_);
   }
 }
 
 void AutofillManager::RenderViewCreated(content::RenderViewHost* host) {
   UpdatePasswordGenerationState(host, true);
 }
 
-void AutofillManager::Observe(
-    int type,
-    const content::NotificationSource& source,
-    const content::NotificationDetails& details) {
+void AutofillManager::OnPreferenceChanged(PrefServiceBase* service,
+                                          const std::string& pref_name) {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
-  DCHECK_EQ(chrome::NOTIFICATION_PREF_CHANGED, type);
-  std::string* pref = content::Details<std::string>(details).ptr();
-  DCHECK(prefs::kPasswordGenerationEnabled == *pref);
+  DCHECK(prefs::kPasswordGenerationEnabled == pref_name);
   UpdatePasswordGenerationState(web_contents()->GetRenderViewHost(), false);
 }
 
 void AutofillManager::OnStateChanged() {
   // It is possible for sync state to change during tab contents destruction.
   // In this case, we don't need to update the renderer since it's going away.
   if (web_contents() && web_contents()->GetRenderViewHost()) {
     UpdatePasswordGenerationState(web_contents()->GetRenderViewHost(),
                                   false);
   }
@@ skipping 1101 matching lines @@
   *profile_guid = IDToGUID(profile_id);
 }
 
 void AutofillManager::UpdateInitialInteractionTimestamp(
     const TimeTicks& interaction_timestamp) {
   if (initial_interaction_timestamp_.is_null() ||
       interaction_timestamp < initial_interaction_timestamp_) {
     initial_interaction_timestamp_ = interaction_timestamp;
   }
 }