gtk: Don't use static variable of user-defined type (in this case a NineBox).
gtk: Don't use static variable of user-defined type (in this case a NineBox).

Instead make it a pointer and initialize it lazily.

BUG=83856
TEST=None

R=tony@chromium.org

Review URL: http://codereview.chromium.org/7695006

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@97538 0039d316-1c4b-4281-b951-d872f2087c98

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