Cleanup: Remove unneeded chrome/browser/prefs/pref_service.h usage....

chrome/browser/notifications/notifications_prefs_cache.cc

 // Copyright (c) 2010 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/notifications/notifications_prefs_cache.h"
 
+#include <string>
+
 #include "base/string_util.h"
+#include "base/values.h"
 #include "base/utf_string_conversions.h"
 #include "chrome/browser/browser_thread.h"
-#include "chrome/browser/prefs/pref_service.h"
 #include "third_party/WebKit/WebKit/chromium/public/WebNotificationPresenter.h"
 
 NotificationsPrefsCache::NotificationsPrefsCache()
         : default_content_setting_(CONTENT_SETTING_DEFAULT),
           is_initialized_(false) {
 }
 
 void NotificationsPrefsCache::CacheAllowedOrigin(
     const GURL& origin) {
   CheckThreadAccess();
@@ skipping 72 matching lines @@
   return denied_origins_.find(origin) != denied_origins_.end();
 }
 
 void NotificationsPrefsCache::CheckThreadAccess() {
   if (is_initialized_) {
     DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
   } else {
     DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
   }
 }