GitLab

BUG=672852
TEST=No more content_unittests, events_unittests, and extensions_unittests failures on linux_chromium_tsan_rel_ng
Confirmed @ https://build.chromium.org/p/tryserver.chromium.linux/builders/linux_chromium_tsan_rel_ng/builds/377

Review-Url: https://codereview.chromium.org/2565893002
Cr-Commit-Position: refs/heads/master@{#437932}