The previous flag was too broad, pulling all Chromium
internal files. We only need one repository.

Bug: angleproject:3630
Bug: chromium:1032708
Change-Id: I8aac322e2f748570432be27f2981f927bd264fce
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/1969735Reviewed-by: Jamie Madill <jmadill@chromium.org>
Commit-Queue: Cody Northrop <cnorthrop@google.com>