Change icon for infobar warning about desktop notifications.
Change icon for infobar warning about desktop notifications.

Contributed by gideonwald@chromium.org
I'm recreating http://codereview.chromium.org/7840001/
gideonwald can't dcommit and binary files break git cl patch.
So I copied and added his pngcrushed image from the bug.

Patch from Gideon Wald <gideonwald@chromium.org>
BUG=94112
TEST=This change just adds the icon, so there should be no user-visible change yet.

Review URL: http://codereview.chromium.org/7841017

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@99866 0039d316-1c4b-4281-b951-d872f2087c98

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