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Sometimes FramePainter is deleted without its window's OnWindowDestroying, so removing the kSoloWindowFramePainterKey property explicitly at the destructor.
Also this CL adds the checks of painter's frame_ and its non_client_view() since they may be NULL on window destroying timing on test.

BUG=155634
TEST=ash_unittests passed with the new test


Review URL: https://chromiumcodereview.appspot.com/11194015

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@162432 0039d316-1c4b-4281-b951-d872f2087c98