Remove NullPointerException.

pkg/unittest/test/matchers_test.dart

Index: pkg/unittest/test/matchers_test.dart
diff --git a/pkg/unittest/test/matchers_test.dart b/pkg/unittest/test/matchers_test.dart
index c9045ad586688d9d96d2c38cba1971d2b1e21d30..81be8fbf22f91350c223cf5ec16e8f13c6278cba 100644
--- a/pkg/unittest/test/matchers_test.dart
+++ b/pkg/unittest/test/matchers_test.dart
@@ -155,16 +155,6 @@ void main() {
             "UnimplementedError.");
     });
 
-    test('throwsNullPointerException', () {
-      shouldPass(() { throw new NullPointerException(''); },
-          throwsNullPointerException);
-      shouldFail(() { throw new Exception(); },
-          throwsNullPointerException,
-        "Expected: throws an exception which matches NullPointerException "
-        "but:  exception <Exception> does not match "
-            "NullPointerException.");
-    });
-
     test('throwsUnsupportedError', () {
       shouldPass(() { throw new UnsupportedError(''); },
           throwsUnsupportedError);