app_sorting() in extension_prefs.h should be private and all access should go
via ExtensionSystem to access app_sorting().

BUG=550759

Review URL: https://codereview.chromium.org/1419823011

Cr-Commit-Position: refs/heads/master@{#360014}
diff --git a/chrome/browser/extensions/extension_service_sync_unittest.cc b/chrome/browser/extensions/extension_service_sync_unittest.cc
index c399a69..3bd4e75 100644
--- a/chrome/browser/extensions/extension_service_sync_unittest.cc
+++ b/chrome/browser/extensions/extension_service_sync_unittest.cc
@@ -571,7 +571,7 @@
     EXPECT_TRUE(initial_ordinal.Equals(app_sync_data->page_ordinal()));
   }
 
-  AppSorting* sorting = ExtensionPrefs::Get(profile())->app_sorting();
+  AppSorting* sorting = ExtensionSystem::Get(profile())->app_sorting();
   sorting->SetAppLaunchOrdinal(app->id(), initial_ordinal.CreateAfter());
   {
     syncer::SyncDataList list =
@@ -623,7 +623,7 @@
           new syncer::FakeSyncChangeProcessor),
       scoped_ptr<syncer::SyncErrorFactory>(new syncer::SyncErrorFactoryMock()));
 
-  ExtensionPrefs::Get(service()->GetBrowserContext())
+  ExtensionSystem::Get(service()->GetBrowserContext())
       ->app_sorting()
       ->OnExtensionMoved(apps[0]->id(), apps[1]->id(), apps[2]->id());
   {