Make sure small notifications get shown.  Previous change to make sure notifications don't shrink caused a regression when the notification is of minimal size (like the one from html5rocks.com), since this is the same as the pre-show size.
Make sure small notifications get shown.  Previous change to make sure notifications don't shrink caused a regression when the notification is of minimal size (like the one from html5rocks.com), since this is the same as the pre-show size.

BUG=40817
TEST=see bug

Review URL: http://codereview.chromium.org/1558031

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@44148 0039d316-1c4b-4281-b951-d872f2087c98

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