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This padding isn't shown; however it causes the headings to jump up when a find is
executed which matches anything in the headers. The referenced chrome bug contains
details on reproducing the problem; the webkit fix is non-trivial and possibly
controversial.

BUG=83292
TEST=Checked pages look the same


Review URL: http://codereview.chromium.org/8555030

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@110938 0039d316-1c4b-4281-b951-d872f2087c98