Duplicating sadtab.png to use as killtab.png until UI team creates production image.
Duplicating sadtab.png to use as killtab.png
until UI team creates production image.

BUG=chromium-os:10711
TEST=checked to make sure the old killtab image isn't shown.

Review URL: http://codereview.chromium.org/6334006

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@71709 0039d316-1c4b-4281-b951-d872f2087c98

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