Change detail input row padding from 8 -> 10.

R=estade@chromium.org
BUG=294481
TEST=visual
NOTRY=true

Review URL: https://codereview.chromium.org/24694002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@225799 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 225799