Prevents repeated delete confirmation dialogs.
Prevents repeated delete confirmation dialogs.

BUG=chromium-os:9130
TEST=Click on the 'delete' link for some file in the downloads pop-up. Then click again and again, and again. Notice that the only one confirmation appeared.

Review URL: http://codereview.chromium.org/5090004

git-svn-id: http://src.chromium.org/svn/trunk/src@67308 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

Former-commit-id: eda6da131f86ab0ac7a736106cdf243444a83b16
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