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When the user hovers over a download item on the shelf that correspond to an interrupted download, the reason for the interruption is displayed in a tooltip.

(Original CL by ahendrickson http://codereview.chromium.org/9968090/ )

BUG=121698
TEST=None


Review URL: http://codereview.chromium.org/10169025

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@133907 0039d316-1c4b-4281-b951-d872f2087c98