button_close_hover.png, button_close.png. These need to be landed before the CL
that uses them.

BUG=none
TBR=noelallen@chromium.org
NOTRY=true

Review URL: https://codereview.chromium.org/13741028

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@192930 0039d316-1c4b-4281-b951-d872f2087c98