The simple math test failed to find the edit link on a non existent
page. It was looking for the text 'Create source' from Vector which is
now simply 'Create'.
Change the PageObject selector to use a CSS selector, more robust to
text changes.
Change-Id: Ifcbd07da8e343b5697fcff6af6ffac90ff4d6420
From an earlier discussion with physikerwelt.
This is one step toward retiring the /qa/browsertest repo
entirely.
Change-Id: I804f32d2a5a984c8eb0dfc50c8ab50a7f1035256
