Remove the last usages of PrefObserver outside of Prefs.

chrome/browser/password_manager/password_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/password_manager/password_manager.h"
 
 #include "base/metrics/histogram.h"
 #include "base/threading/platform_thread.h"
 #include "base/string_util.h"
 #include "base/utf_string_conversions.h"
@@ skipping 68 matching lines @@
                         new PasswordManager(contents, delegate));
 }
 
 PasswordManager::PasswordManager(WebContents* web_contents,
                                  PasswordManagerDelegate* delegate)
     : content::WebContentsObserver(web_contents),
       delegate_(delegate),
       observer_(NULL) {
   DCHECK(delegate_);
   password_manager_enabled_.Init(prefs::kPasswordManagerEnabled,
-                                 delegate_->GetProfile()->GetPrefs(), NULL);
+                                 delegate_->GetProfile()->GetPrefs());
 
   ReportMetrics(*password_manager_enabled_);
 }
 
 PasswordManager::~PasswordManager() {
 }
 
 void PasswordManager::SetFormHasGeneratedPassword(const PasswordForm& form) {
   for (ScopedVector<PasswordFormManager>::iterator iter =
            pending_login_managers_.begin();
@@ skipping 207 matching lines @@
       delegate_->FillPasswordForm(fill_data);
       return;
     }
     default:
       if (observer_) {
         observer_->OnAutofillDataAvailable(preferred_match.username_value,
                                            preferred_match.password_value);
       }
   }
 }