Fix context menu on download item.
Fix context menu on download item.

BUG=none
TEST=Click arrow part of download item. A context menu should appear.

Review URL: http://codereview.chromium.org/159174

git-svn-id: http://src.chromium.org/svn/trunk/src@21231 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

Former-commit-id: f1b13caadc7d2919c71a6065e39bb9f1c5d76ea5
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