DOMUI: Fix an issue where the sample font text would display outside its containing div. Also fix a margin issue.
DOMUI: Fix an issue where the sample font text would display outside its
containing div. Also fix a margin issue.

BUG=70650
TEST=none

Review URL: http://codereview.chromium.org/6241014

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@72369 0039d316-1c4b-4281-b951-d872f2087c98

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