Fixed compiler warning C4456 'declaration of variable hides previous local declaration'. BUG=angleproject:1119 Change-Id: I99572711ceeae94fb920d197c86e741945d3b60b Reviewed-on: https://chromium-review.googlesource.com/292279 Tested-by: Cooper Partin <coopp@microsoft.com> Reviewed-by: Jamie Madill <jmadill@chromium.org>