[Mac] Remove the image scaling on checkboxes and radios to kill a bunch of warnings from the 10.6 toolchain.
[Mac] Remove the image scaling on checkboxes and radios to kill a bunch of warnings from the 10.6 toolchain.

BUG=none
TEST=less warnings on 10.6 builds, everything still works
Review URL: http://codereview.chromium.org/838005

git-svn-id: http://src.chromium.org/svn/trunk/src@41432 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

Former-commit-id: 6f0550cc52780e51bde5b4ca1acbb19e2acee1e0
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