Change string used to annotate static type issues to 'static type warning' in multitest

tests/language/src/FauxverrideTest.dart

 // Copyright (c) 2011, 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 that static members cannot be overridden (static type error only).
+// Test that static members cannot be overridden (static type warning only).
 
 m() {}
 
 class Super {
   Super() {}
   // No error from hiding.
   static m() {}
 
   static var i;
 
   instanceMethod() {}
 }
 
 class Sub extends Super {
   Sub() : super();
-  static m() {} /// 01: static type error
+  static m() {} /// 01: static type warning
 
-  static var i; /// 02: static type error
+  static var i; /// 02: static type warning
 
   static instanceMethod() {} /// 03: compile-time error
 
-  static i() {} /// 04: static type error
+  static i() {} /// 04: static type warning
 
   static var instanceMethod; /// 05: compile-time error
 
   foo() {}
 }
 
 main() {
   new Sub().foo();
 }