Clear cache after showing Sync confirmation bubble

chrome/browser/ui/webui/ntp/ntp_resource_cache.cc

 // Copyright (c) 2011 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/ntp/ntp_resource_cache.h"
 
 #include <vector>
 
 #include "base/command_line.h"
 #include "base/file_util.h"
@@ skipping 165 matching lines @@
                  content::NotificationService::AllSources());
   registrar_.Add(this, chrome::NTP4_INTRO_PREF_CHANGED,
                  content::NotificationService::AllSources());
 
   // Watch for pref changes that cause us to need to invalidate the HTML cache.
   pref_change_registrar_.Init(profile_->GetPrefs());
   pref_change_registrar_.Add(prefs::kSyncAcknowledgedSyncTypes, this);
   pref_change_registrar_.Add(prefs::kShowBookmarkBar, this);
   pref_change_registrar_.Add(prefs::kHomePageIsNewTabPage, this);
   pref_change_registrar_.Add(prefs::kNTPShownPage, this);
+  pref_change_registrar_.Add(prefs::kSyncPromoShowNTPBubble, this);
 }
 
 NTPResourceCache::~NTPResourceCache() {}
 
 RefCountedMemory* NTPResourceCache::GetNewTabHTML(bool is_incognito) {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
   if (is_incognito) {
     if (!new_tab_incognito_html_.get())
       CreateNewTabIncognitoHTML();
   } else {
@@ skipping 387 matching lines @@
       IDR_NEW_TAB_4_THEME_CSS : IDR_NEW_TAB_THEME_CSS;
   static const base::StringPiece new_tab_theme_css(
       ResourceBundle::GetSharedInstance().GetRawDataResource(
           ntp_css_resource_id));
 
   // Create the string from our template and the replacements.
   std::string css_string;
   css_string = ReplaceStringPlaceholders(new_tab_theme_css, subst, NULL);
   new_tab_css_ = base::RefCountedString::TakeString(&css_string);
 }