Move the extensions warning on the incognito NTP into the grey box.
Move the extensions warning on the incognito NTP into the grey box.

This fixes an issue where the text would be unreadable with certain themes
installed.

BUG=45971
TEST=see bug for repro steps

Review URL: http://codereview.chromium.org/3497002

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@60359 0039d316-1c4b-4281-b951-d872f2087c98

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