Update an analyzer test.
Update an analyzer test.

https://github.com/dart-lang/sdk/commit/da9c12350423142bf4ab90a56ce5263241355463
changed the analyzer's patch support to allow introduction of private
toplevel variable declarations.  There was a negative test that these
were not supported which needs to be rewritten to test that they are
supported correctly.

BUG=
R=jensj@google.com

Review-Url: https://codereview.chromium.org/2565683002 .

dart-lang/sdk,dart-archive/dart-sdk,dartino/dart-sdk,dartino/dart-sdk,dart-archive/dart-sdk,dartino/dart-sdk,dartino/dart-sdk,dartino/dart-sdk,dart-lang/sdk,dart-lang/sdk,dart-archive/dart-sdk,dart-archive/dart-sdk,dartino/dart-sdk,dartino/dart-sdk,dart-archive/dart-sdk,dart-lang/sdk,dart-archive/dart-sdk,dart-lang/sdk,dart-archive/dart-sdk,dart-lang/sdk,dartino/dart-sdk,dartino/dart-sdk,dart-archive/dart-sdk,dart-lang/sdk,dart-archive/dart-sdk,dart-lang/sdk