Remove the last usages of PrefObserver outside of Prefs.

chrome/browser/ui/webui/options/font_settings_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/font_settings_handler.h"
 
 #include <string>
 
 #include "base/basictypes.h"
 #include "base/bind.h"
@@ skipping 88 matching lines @@
   SetUpFixedFontSample();
   SetUpMinimumFontSample();
 }
 
 void FontSettingsHandler::RegisterMessages() {
   // Perform validation for saved fonts.
   PrefService* pref_service = Profile::FromWebUI(web_ui())->GetPrefs();
   FontSettingsUtilities::ValidateSavedFonts(pref_service);
 
   // Register for preferences that we need to observe manually.
-  font_encoding_.Init(prefs::kDefaultCharset, pref_service, NULL);
+  font_encoding_.Init(prefs::kDefaultCharset, pref_service);
 
   standard_font_.Init(prefs::kWebKitStandardFontFamily,
                       pref_service,
                       base::Bind(&FontSettingsHandler::SetUpStandardFontSample,
                                  base::Unretained(this)));
   serif_font_.Init(prefs::kWebKitSerifFontFamily,
                    pref_service,
                    base::Bind(&FontSettingsHandler::SetUpSerifFontSample,
                               base::Unretained(this)));
   sans_serif_font_.Init(
@@ skipping 124 matching lines @@
                                    size_value);
 }
 
 void FontSettingsHandler::OnWebKitDefaultFontSizeChanged() {
   SetUpStandardFontSample();
   SetUpSerifFontSample();
   SetUpSansSerifFontSample();
 }
 
 }  // namespace options