Change "typedef" to "class" in core library and related tests.

tests/language/mixin_illegal_superclass_test.dart

 // Copyright (c) 2013, 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 S0 { }
 class S1 extends Object { }
 class S2 extends S0 { }
 
 class M0 { }
 class M1 extends Object { }
 class M2 extends M0 { }
 
-typedef C00 = S0 with M0;
-typedef C01 = S0 with M1;
-typedef C02 = S0 with M2;      /// 01: compile-time error
-typedef C03 = S0 with M0, M1;
-typedef C04 = S0 with M0, M2;  /// 02: compile-time error
-typedef C05 = S0 with M2, M0;  /// 03: compile-time error
-typedef C06 = S0 with M1, M2;  /// 04: compile-time error
-typedef C07 = S0 with M2, M1;  /// 05: compile-time error
+class C00 = S0 with M0;
+class C01 = S0 with M1;
+class C02 = S0 with M2;      /// 01: compile-time error
+class C03 = S0 with M0, M1;
+class C04 = S0 with M0, M2;  /// 02: compile-time error
+class C05 = S0 with M2, M0;  /// 03: compile-time error
+class C06 = S0 with M1, M2;  /// 04: compile-time error
+class C07 = S0 with M2, M1;  /// 05: compile-time error
 
-typedef C10 = S1 with M0;
-typedef C11 = S1 with M1;
-typedef C12 = S1 with M2;      /// 06: compile-time error
-typedef C13 = S1 with M0, M1;
-typedef C14 = S1 with M0, M2;  /// 07: compile-time error
-typedef C15 = S1 with M2, M0;  /// 08: compile-time error
-typedef C16 = S1 with M1, M2;  /// 09: compile-time error
-typedef C17 = S1 with M2, M1;  /// 10: compile-time error
+class C10 = S1 with M0;
+class C11 = S1 with M1;
+class C12 = S1 with M2;      /// 06: compile-time error
+class C13 = S1 with M0, M1;
+class C14 = S1 with M0, M2;  /// 07: compile-time error
+class C15 = S1 with M2, M0;  /// 08: compile-time error
+class C16 = S1 with M1, M2;  /// 09: compile-time error
+class C17 = S1 with M2, M1;  /// 10: compile-time error
 
-typedef C20 = S2 with M0;
-typedef C21 = S2 with M1;
-typedef C22 = S2 with M2;      /// 11: compile-time error
-typedef C23 = S2 with M0, M1;
-typedef C24 = S2 with M0, M2;  /// 12: compile-time error
-typedef C25 = S2 with M2, M0;  /// 13: compile-time error
-typedef C26 = S2 with M1, M2;  /// 14: compile-time error
-typedef C27 = S2 with M2, M1;  /// 15: compile-time error
+class C20 = S2 with M0;
+class C21 = S2 with M1;
+class C22 = S2 with M2;      /// 11: compile-time error
+class C23 = S2 with M0, M1;
+class C24 = S2 with M0, M2;  /// 12: compile-time error
+class C25 = S2 with M2, M0;  /// 13: compile-time error
+class C26 = S2 with M1, M2;  /// 14: compile-time error
+class C27 = S2 with M2, M1;  /// 15: compile-time error
 
 class D00 extends S0 with M0 { }
 class D01 extends S0 with M1 { }
 class D02 extends S0 with M2 { }      /// 16: compile-time error
 class D03 extends S0 with M0, M1 { }
 class D04 extends S0 with M0, M2 { }  /// 17: compile-time error
 class D05 extends S0 with M2, M0 { }  /// 18: compile-time error
 class D06 extends S0 with M1, M2 { }  /// 19: compile-time error
 class D07 extends S0 with M2, M1 { }  /// 20: compile-time error
 
@@ skipping 63 matching lines @@
 
   new D20();
   new D21();
   new D22();  /// 26: continued
   new D23();
   new D24();  /// 27: continued
   new D25();  /// 28: continued
   new D26();  /// 29: continued
   new D27();  /// 30: continued
 }