GitLab

Also while here:
 - const scoped_refptr<>& => scoped_refptr<> + std::move
   (helps avoiding unnecessary refcount bumps:
    https://groups.google.com/a/chromium.org/d/topic/chromium-dev/TlL1D-Djta0/discussion)

BUG=646443

Review-Url: https://codereview.chromium.org/2338363002
Cr-Commit-Position: refs/heads/master@{#418855}