cros flash: read latest link to resolve a revision

BUG=chromium:899801
TEST=precq

Change-Id: Ice26b19ff0b99aa1d4a8cdb1cf4987cc3d025f3f
Reviewed-on: https://chromium-review.googlesource.com/1308313
Commit-Ready: ChromeOS CL Exonerator Bot <chromiumos-cl-exonerator@appspot.gserviceaccount.com>
Tested-by: Alex Klein <saklein@chromium.org>
Reviewed-by: Mike Frysinger <vapier@chromium.org>
2 files changed