The current libwebm integration test samples contain `libwebm-0.2.1` however we have updated to a newer version of libwebm so we need to update the samples. As of `libwebm-0.3.0` this signature has been frozen so we won't have to do this again.
Since a project URL is encoded into outputs, this means also updating the golden output files. Closes #1043
Closes #453. Change-Id: I68e46fb83cbf7e62a19fa83698cb66bfc0acd98d