Fix to allow browser close after download initiated from chrome:// url.

R=brettw
BUG=12745

Review URL: http://codereview.chromium.org/150122

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@19752 0039d316-1c4b-4281-b951-d872f2087c98
3 files changed