Mock sync to be enabled in siteUtilTest
Mock sync to be enabled in siteUtilTest

The test was failing due to 41a997e4b7ccebf0791afd9076525c22443d21cb

Auditors: @ayumi

Test Plan: npm run unittest

timborden/browser-laptop,luixxiul/browser-laptop,diasdavid/browser-laptop,diasdavid/browser-laptop,luixxiul/browser-laptop,luixxiul/browser-laptop,timborden/browser-laptop,timborden/browser-laptop,diasdavid/browser-laptop,luixxiul/browser-laptop,timborden/browser-laptop,diasdavid/browser-laptop