GitLab

Use wtf_size_t where appropriate.

BUG=879657

Change-Id: I26f766e7f6f29c6beaf0d396d665f1eba1235d83
Reviewed-on: https://chromium-review.googlesource.com/c/1298246
Commit-Queue: Dave Tapuska <dtapuska@chromium.org>
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Cr-Commit-Position: refs/heads/master@{#603101}