[Sync] Fix EnableDisableSingleClientTest

chrome/browser/sync/chrome_sync_client.cc

Index: chrome/browser/sync/chrome_sync_client.cc
diff --git a/chrome/browser/sync/chrome_sync_client.cc b/chrome/browser/sync/chrome_sync_client.cc
index 2571a605ca9bc29a0994bf68abbce6b70ff88f52..6281bee1a1d2c4a9aeb24a93155ec768cf98f2e9 100644
--- a/chrome/browser/sync/chrome_sync_client.cc
+++ b/chrome/browser/sync/chrome_sync_client.cc
@@ -679,7 +679,6 @@ void ChromeSyncClient::RegisterDesktopDataTypes(
             BrowserThread::GetTaskRunnerForThread(BrowserThread::UI)));
   }
 
-  // TODO(lgcheng): Add switch for this.

[skym, 2017/03/16 23:27:19]

Why didn't you add the switch back here, Gang? I thought we talked about adding
it back on Wednesday.

[Gang Wu, 2017/03/17 19:23:22]

Done.

   sync_service->RegisterDataTypeController(
       base::MakeUnique<ArcPackageSyncDataTypeController>(
           syncer::ARC_PACKAGE, error_callback, this, profile_));