GitLab

Use wtf_size_t as opposed to size_t

BUG=879657

Change-Id: If00143969f0c18bbfb54b6b602e5b915e756dd3b
Reviewed-on: https://chromium-review.googlesource.com/c/1349750Reviewed-by: Kentaro Hara <haraken@chromium.org>
Commit-Queue: Dave Tapuska <dtapuska@chromium.org>
Cr-Commit-Position: refs/heads/master@{#610647}