Files.app: Hides quiet progress items after they are completed.

Previously quiet progress items which don't have progress bar were wrongly
regarded as they have a progress bar and the bar is animated. The items marked
as animated wait for the CSS transition-end event but it never happens.

This CL fix the condition to determine if an item should be animated or not.

BUG=336309
TEST=manually

Review URL: https://codereview.chromium.org/135573003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@246024 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 246024