Respect --noworkon for Chrome.

This makes it possible for builders to set CHROME_ORIGIN=LOCAL_SOURCE
but not build Chrome every time.

BUG=chromium:341136
TEST=cbuildbot run of release group.

Change-Id: I8b59bfee81018412f0f9b1f4953569f8075609d4
Reviewed-on: https://chromium-review.googlesource.com/185023
Reviewed-by: Matt Tennant <mtennant@chromium.org>
Tested-by: David James <davidjames@chromium.org>
Commit-Queue: David James <davidjames@chromium.org>
1 file changed