Fix crash in DeleteStream.
Fix crash in DeleteStream.

BUG=none
TEST=none

Review URL: http://codereview.chromium.org/2860004

git-svn-id: http://src.chromium.org/svn/trunk/src@49923 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

Former-commit-id: e78f17d9fd1774e191a1e76189d37214e2ed7f14
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