GitLab

This reverts commit 31111d18.

Conflicts:
	content/browser/web_contents/web_contents_impl.h

BUG=407376
TEST=no crashing, we hope
TBR=rsesek@chromium.org, creis@chromium.org

Review URL: https://codereview.chromium.org/643793003

Cr-Commit-Position: refs/heads/master@{#300510}