ntp4: make focused most visited tile more obvious
ntp4: make focused most visited tile more obvious

make :focus match :hover completely

BUG=none, but I remember mwichary complaining about this
TEST=manual


Review URL: http://codereview.chromium.org/8439022

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@109555 0039d316-1c4b-4281-b951-d872f2087c98

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