Set the gtk drag icon to a 1x1 transparent pixbuf so we don't get the default drag icon.
Set the gtk drag icon to a 1x1 transparent pixbuf so we don't get the default drag icon.

BUG=none
TEST=Drag a tab out of the tabstrip.  The default gtk drag icon should not be visible.
Review URL: http://codereview.chromium.org/131043

git-svn-id: http://src.chromium.org/svn/trunk/src@18734 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

Former-commit-id: 30087bf68191a633c11fe634f2eefdbfd58755ee
meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser