Suppress a data race in sync (TSan/unit) BUG=72913 TEST=TSan/unit goes green TBR=oshima Review URL: http://codereview.chromium.org/6515008
Suppress a data race in sync (TSan/unit)
BUG=72913
TEST=TSan/unit goes green
TBR=oshima
Review URL: http://codereview.chromium.org/6515008

git-svn-id: http://src.chromium.org/svn/trunk/src@74797 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

Former-commit-id: 4ecbf3eee7bf14ec4211e7cc5209fcd8260552a2
meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser