Use updated external/chromium

Change-Id: Ib9754023329c869a8fa0fc8147c51ebf4557f53e
keep launcher 3 for test builds

Change-Id: I49f19096766ea81bbc5e108662e67e76008a27dc
Vendor Tests

Change-Id: I99aa65da5ffb2b78b5cb016d281db60bf605836d