Remove touch_140/touch_180 assets.
 They're no longer in use.

BUG=299852
R=girard@chromium.org

Review URL: https://codereview.chromium.org/25103002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@226041 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 226041