Update language tests to new getter syntax.

dart/tests/language/instance_compound_assignment_operator_test.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.
 // Test correct instance compound assignment operator.
 
 class A {
   A() : f = 2 {}
   var f;
   operator [](index) => f;
   operator []=(index, value) => f = value;
 
   var _g = 0;
   var gGetCount = 0;
   var gSetCount = 0;
-  get g() {
+  get g {
     gGetCount++;
     return _g;
   }
   set g(value) {
     gSetCount++;
     _g = value;
   }
 }
 
 
 class B {
   B() : _a = new A(), count = 0 {}
-  get a() {
+  get a {
     count++;
     return _a;
   }
   var _a;
   var count;
 }
 
 var globalA;
 var fooCounter = 0;
 foo() {
@@ skipping 33 matching lines @@
   Expect.equals(1, b._a.gGetCount);
   Expect.equals(1, b._a.gSetCount);
   Expect.equals(1, b._a._g);
 
   globalA = b._a;
   globalA.f = 0;
   foo().f += 1;
   Expect.equals(1, fooCounter);
   Expect.equals(1, globalA.f);
 }