Fix set parent race condition

 Alter the openTab method to make sure that the parent is
 always set before trying to load a url. This is done because
 some web settings (useragent) are now inherited from the parent,
 and we need to make sure those are applied before the UA is sent
 to the server.

Change-Id: Ib33b75ac4648e8ba1ede9bb92406ea175aabb19d
3 files changed