Allow method-calls to getters (assuming they contain closures).

frog/tests/leg_only/src/Closure6Test.dart

+// Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+class A {
+  var foo;
+  bar() => foo(3, 99);
+  gee(f) => foo(fun: f);
+
+  get foo2() => foo;
+  bar2() => foo2(3, 99);
+  gee2(f) => foo2(fun: f);
+}
+
+main() {
+  var a = new A();
+  a.foo = () => 499;
+  Expect.equals(499, a.foo());
+  a.foo = (x, y) => x + y;
+  Expect.equals(102, a.bar());
+  a.foo = ([fun = null]) => fun(41);
+  Expect.equals(42, a.gee((x) => x + 1));
+
+  a.foo = () => 499;
+  Expect.equals(499, a.foo2());
+  a.foo = (x, y) => x + y;
+  Expect.equals(102, a.bar2());
+  a.foo = ([fun = null]) => fun(41);
+  Expect.equals(42, a.gee2((x) => x + 1));
+}