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: dd90618784b6a4b323ea0c23a071cb1c9e6f2ac7@71709 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser