Use page-object waiting API instead of Selenium waiting API

Fixes page-object deprecation warning.

More information:

http://watirwebdriver.com/waiting/
https://github.com/cheezy/page-object/wiki/Ajax-Calls

Change-Id: Ia18339e2fd6b23098b86dd96f3fa9c84f64c28c3
Merge "Use page-object waiting API instead of Selenium waiting API"