[Sync] Switch bots to run integ tests for autofill as USS.

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 18a503d02cdfc2834ee9c933fd76ea5e93bf89ad..295fdfb8744f2e644e06eb11f0344dbc64232807 100644
--- a/chrome/browser/sync/chrome_sync_client.cc
+++ b/chrome/browser/sync/chrome_sync_client.cc
@@ -449,8 +449,7 @@ ChromeSyncClient::GetSyncBridgeForModelType(syncer::ModelType type) {
       return base::WeakPtr<syncer::ModelTypeSyncBridge>();
     case syncer::AUTOFILL:
       return autofill::AutocompleteSyncBridge::FromWebDataService(
-                 web_data_service_.get())
-          ->AsWeakPtr();
+          web_data_service_.get());
 #if defined(OS_CHROMEOS)
     case syncer::PRINTERS:
       return chromeos::PrintersManagerFactory::GetForBrowserContext(profile_)