Remove the last usages of PrefObserver outside of Prefs.

chrome/browser/ui/webui/options/clear_browser_data_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/clear_browser_data_handler.h"
 
 #include "base/basictypes.h"
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/string16.h"
@@ skipping 23 matching lines @@
     : remover_(NULL) {
 }
 
 ClearBrowserDataHandler::~ClearBrowserDataHandler() {
   if (remover_)
     remover_->RemoveObserver(this);
 }
 
 void ClearBrowserDataHandler::InitializeHandler() {
   clear_plugin_lso_data_enabled_.Init(prefs::kClearPluginLSODataEnabled,
-                                      Profile::FromWebUI(web_ui())->GetPrefs(),
-                                      NULL);
+                                      Profile::FromWebUI(web_ui())->GetPrefs());
   pepper_flash_settings_enabled_.Init(prefs::kPepperFlashSettingsEnabled,
-                                      Profile::FromWebUI(web_ui())->GetPrefs(),
-                                      NULL);
+                                      Profile::FromWebUI(web_ui())->GetPrefs());
 }
 
 void ClearBrowserDataHandler::GetLocalizedValues(
     DictionaryValue* localized_strings) {
   DCHECK(localized_strings);
 
   static OptionsStringResource resources[] = {
     { "clearBrowserDataLabel", IDS_CLEAR_BROWSING_DATA_LABEL },
     { "deleteBrowsingHistoryCheckbox", IDS_DEL_BROWSING_HISTORY_CHKBOX },
     { "deleteDownloadHistoryCheckbox", IDS_DEL_DOWNLOAD_HISTORY_CHKBOX },
@@ skipping 98 matching lines @@
 }
 
 void ClearBrowserDataHandler::OnBrowsingDataRemoverDone() {
   // No need to remove ourselves as an observer as BrowsingDataRemover deletes
   // itself after we return.
   remover_ = NULL;
   web_ui()->CallJavascriptFunction("ClearBrowserDataOverlay.doneClearing");
 }
 
 }  // namespace options