Fixes crash in dragging side tabs.
Fixes crash in dragging side tabs.

BUG=none
TEST=enable side tabs and make sure you can detach them.
R=ben@chromium.org

Review URL: http://codereview.chromium.org/6828002

git-svn-id: http://src.chromium.org/svn/trunk/src@81360 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

Former-commit-id: 734edb25dd5bbb070eb264352dd459168f7bc4b6
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