Bump libwebp version to that roughly matching  Chrome 21, has some important fixes.
Bump libwebp version to that roughly matching 
Chrome 21, has some important fixes.

crowell/modpagespeed_tmp,crowell/modpagespeed_tmp,crowell/modpagespeed_tmp,crowell/modpagespeed_tmp,crowell/modpagespeed_tmp,crowell/modpagespeed_tmp,crowell/modpagespeed_tmp