Remove ExtensionPrefs's dependency on ChromeAppSorting.

chrome/browser/extensions/chrome_extensions_browser_client.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_extensions_browser_client.h"
 
 #include "base/command_line.h"
 #include "base/version.h"
 #include "chrome/browser/browser_process.h"
+#include "chrome/browser/extensions/chrome_app_sorting.h"
 #include "chrome/browser/extensions/extension_prefs.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/profiles/profile_manager.h"
 #include "chrome/browser/ui/browser_finder.h"
 #include "chrome/common/chrome_switches.h"
 #include "chrome/common/chrome_version_info.h"
 #include "chrome/common/pref_names.h"
 
 namespace extensions {
 
@@ skipping 86 matching lines @@
   pref_service->SetString(prefs::kExtensionsLastChromeVersion,
                           current_version);
 
   // If there was no version string in prefs, assume we're out of date.
   if (!last_version.IsValid())
     return true;
 
   return last_version.IsOlderThan(current_version);
 }
 
+scoped_ptr<AppSorting> ChromeExtensionsBrowserClient::CreateAppSorting() {
+  return scoped_ptr<AppSorting>(new ChromeAppSorting()).Pass();
+}
+
 // static
 ChromeExtensionsBrowserClient* ChromeExtensionsBrowserClient::GetInstance() {
   return g_client.Pointer();
 }
 
 }  // namespace extensions