Convert ebuild to pull chrome sources from git.

BUG=chromium:376027
TEST=release builders pull from git and build successfully.

Change-Id: I251d86cd928fcfff516b0e5e955bab05068aa3f6
Reviewed-on: https://chromium-review.googlesource.com/214120
Reviewed-by: Stefan Zager <szager@chromium.org>
Tested-by: Stefan Zager <szager@chromium.org>
11 files changed