Remove ExtensionPrefs's dependency on ChromeAppSorting.

chrome/browser/extensions/chrome_app_sorting.cc

 // Copyright 2013 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/extensions/chrome_app_sorting.h"
 
 #include <algorithm>
 #include <vector>
 
 #include "chrome/browser/chrome_notification_types.h"
@@ skipping 28 matching lines @@
 ////////////////////////////////////////////////////////////////////////////////
 // ChromeAppSorting::AppOrdinals
 
 ChromeAppSorting::AppOrdinals::AppOrdinals() {}
 
 ChromeAppSorting::AppOrdinals::~AppOrdinals() {}
 
 ////////////////////////////////////////////////////////////////////////////////
 // ChromeAppSorting
 
-ChromeAppSorting::ChromeAppSorting(ExtensionScopedPrefs* extension_scoped_prefs)
-    : extension_scoped_prefs_(extension_scoped_prefs),
+ChromeAppSorting::ChromeAppSorting()
+    : extension_scoped_prefs_(NULL),
       extension_sync_service_(NULL),
       default_ordinals_created_(false) {
 }
 
 ChromeAppSorting::~ChromeAppSorting() {
 }
 
+void ChromeAppSorting::SetExtensionScopedPrefs(ExtensionScopedPrefs* prefs) {
+  extension_scoped_prefs_ = prefs;
+}
+
 void ChromeAppSorting::SetExtensionSyncService(
     ExtensionSyncService* extension_sync_service) {
   extension_sync_service_ = extension_sync_service;
 }
 
 void ChromeAppSorting::Initialize(
     const extensions::ExtensionIdList& extension_ids) {
   InitializePageOrdinalMap(extension_ids);
 
   MigrateAppIndex(extension_ids);
@@ skipping 540 matching lines @@
   for (AppLaunchOrdinalMap::const_iterator it = m.begin(); it != m.end();
        ++it) {
     const std::string& id = it->second;
     if (ntp_hidden_extensions_.count(id) == 0)
       result++;
   }
   return result;
 }
 
 }  // namespace extensions