GitLab

Several files includes gmock.h but does not use GMock. Remove the
gmock.h include, or replace it with gtest.h.

Change-Id: Id1c1928365ff0124c80c0f7baaaa2388c530472a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1727471Reviewed-by: Henrique Nakashima <hnakashima@chromium.org>
Commit-Queue: Lei Zhang <thestig@chromium.org>
Cr-Commit-Position: refs/heads/master@{#682771}