The previous assets had an extra 1px on each side.

BUG=399696
R=oshima@chromium.org

Review URL: https://codereview.chromium.org/473933002

Cr-Commit-Position: refs/heads/master@{#289660}
git-svn-id: svn://svn.chromium.org/chrome/trunk/src@289660 0039d316-1c4b-4281-b951-d872f2087c98