Also fix the check for uniform buffer size to use the actual buffer
size instead of the size of the bound range.

Bug: 820639
Change-Id: Iaa2a617ee7ce5ce7cfabbf64bd1d6f8c82c46b65
Reviewed-on: https://chromium-review.googlesource.com/965627
Commit-Queue: James Darpinian <jdarpinian@chromium.org>
Reviewed-by: Jamie Madill <jmadill@chromium.org>