Additionally, note in the Mac code that the icon padding is the same
as for views.  Because that's what the bug was originally about.

BUG=42485
TEST=content settings still look right.

Review URL: http://codereview.chromium.org/3034003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@52610 0039d316-1c4b-4281-b951-d872f2087c98