Fixing windows coverage archive to actually archive.
Fixing windows coverage archive to actually archive.

The last fix did not actually work on the bots
(it merely suppressed the error code).

Using new recursive copy option in gsutil in lieu of separate script.
This solution has been tried on the bots.

BUG=None
TEST=local test on bots
R=jfb@chromium.org

Review URL: https://codereview.chromium.org/15705007

git-svn-id: 721b910a23eff8a86f00c8fd261a7587cddf18f8@11432 fcba33aa-ac0c-11dd-b9e7-8d5594d729c2

sbc100/native_client,sbc100/native_client,sbc100/native_client,sbc100/native_client,sbc100/native_client,sbc100/native_client