Remove content::NotificationObserver dependency from most Prefs code.

chrome/browser/ui/webui/options/password_manager_handler.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/ui/webui/options/password_manager_handler.h"
 
 #include "base/bind.h"
 #include "base/string_number_conversions.h"
 #include "base/utf_string_conversions.h"
 #include "base/values.h"
@@ skipping 91 matching lines @@
 void PasswordManagerHandler::OnLoginsChanged() {
   UpdatePasswordLists(NULL);
 }
 
 PasswordStore* PasswordManagerHandler::GetPasswordStore() {
   return PasswordStoreFactory::GetForProfile(
       Profile::FromWebUI(web_ui()),
       Profile::EXPLICIT_ACCESS);
 }
 
-void PasswordManagerHandler::Observe(
-    int type,
-    const content::NotificationSource& source,
-    const content::NotificationDetails& details) {
-  if (type == chrome::NOTIFICATION_PREF_CHANGED) {
-    std::string* pref_name = content::Details<std::string>(details).ptr();
-    if (*pref_name == prefs::kPasswordManagerAllowShowPasswords) {
-      UpdatePasswordLists(NULL);
-    }
-  }
-
-  OptionsPageUIHandler::Observe(type, source, details);
+void PasswordManagerHandler::OnPreferenceChanged(PrefServiceBase* service,
+                                                 const std::string& pref_name) {
+  DCHECK_EQ(std::string(prefs::kPasswordManagerAllowShowPasswords), pref_name);
+  UpdatePasswordLists(NULL);
 }
 
 void PasswordManagerHandler::UpdatePasswordLists(const ListValue* args) {
   // Reset the current lists.
   password_list_.clear();
   password_exception_list_.clear();
 
   languages_ = Profile::FromWebUI(web_ui())->GetPrefs()->
       GetString(prefs::kAcceptLanguages);
   populater_.Populate();
@@ skipping 139 matching lines @@
         const std::vector<content::PasswordForm*>& result) {
   DCHECK_EQ(pending_login_query_, handle);
   pending_login_query_ = 0;
   page_->password_exception_list_.clear();
   page_->password_exception_list_.insert(page_->password_exception_list_.end(),
                                          result.begin(), result.end());
   page_->SetPasswordExceptionList();
 }
 
 }  // namespace options