GitLab

Lock order was inverted while stopping the stream which can lead
to deadlock.

BUG=327817,374135
TEST=No more lock inversion warning from TSANv2.
R=ajwong@chromium.org, dgreid@chromium.org
TBR=awong

Review URL: https://codereview.chromium.org/348843004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@278885 0039d316-1c4b-4281-b951-d872f2087c98