[autotest] update compile_gwt_clients to log error on failure.

Currently we log info on a failure, update this to log error.

BUG=chromium:384661
TEST=Compile_gwt_client still works.

Change-Id: I29ea194c474ad5f83629ec89a0a4cc2b338cb607
Reviewed-on: https://chromium-review.googlesource.com/204550
Reviewed-by: Gwendal Grignou <gwendal@chromium.org>
Commit-Queue: Simran Basi <sbasi@chromium.org>
Tested-by: Simran Basi <sbasi@chromium.org>
1 file changed