ntp4: re-add a css change
ntp4: re-add a css change

I believe this was lost in some local merge. It prevents the default focus indicator for nav dots.

BUG=none
TEST=manual

Review URL: http://codereview.chromium.org/7545026

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@95384 0039d316-1c4b-4281-b951-d872f2087c98

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