Remove 5 px on right of these volume buttons to make all volume buttons the same size and remove and anti-aliasing effect on volume change in the new controls.

Note: this has no effect on current video controls since these resources are not currently used. Will clean up old resources once new resources have landed.

Patch by silviapf@chromium.org:
http://codereview.chromium.org/10262006/

BUG=88489
TEST=None required - only image update.

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@134862 0039d316-1c4b-4281-b951-d872f2087c98