Revert tests to their original form, these were missed out in an earlier CL.

tests/language/src/ThirdTest.dart

Index: tests/language/src/ThirdTest.dart
===================================================================
--- tests/language/src/ThirdTest.dart	(revision 3918)
+++ tests/language/src/ThirdTest.dart	(working copy)
@@ -3,7 +3,7 @@
 // BSD-style license that can be found in the LICENSE file.
 // Third dart test program.
 
-class A {
+class A extends B {
   var a;
   static var s;
 
@@ -11,10 +11,10 @@
     return s;
   }
 
-  A(x, y) : a = x + y + 1 { }
+  A(x, y) : super(y), a = x { }
 
   value() {
-    return a + foo();
+    return a + b + foo();
   }
 }