Change return type of get typeVariables and typeArguments in ClassMirror.

tests/lib/mirrors/generics_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.
 
 library test.type_arguments_test;
 
 import 'dart:mirrors';
 
 import 'package:expect/expect.dart';
 
 class A<T> {}
 class B extends A {}            // Same as class B extends A<dynamic>.
 class C extends A<num, int> {}  // Same as class C extends A<dynamic>.
 class D extends A<int> {}
 class E<S> extends A<S> {}
 class F<R> extends A<int> {}
 class G {}
 class H<A,B,C> {}
 
 typeParameters(mirror, parameterNames) {
   Expect.listEquals(parameterNames.map((n) => new Symbol(n)).toList(),
-                    mirror.typeVariables.keys.toList());
+                    mirror.typeVariables.map((v) => v.simpleName).toList());
 }
 
 typeArguments(mirror, argumentMirrors) {
   Expect.listEquals(argumentMirrors,
-                    mirror.typeArguments.values.toList());
-  if (!mirror.isOriginalDeclaration) {
-    Expect.listEquals(mirror.typeVariables.keys.toList(),
-                      mirror.typeArguments.keys.toList());
-  }
+                    mirror.typeArguments);
 }
 
 main() {
   // Declarations.
   typeParameters(reflectClass(A), ['T']);
   typeParameters(reflectClass(B), []);
   typeParameters(reflectClass(C), []);
   typeParameters(reflectClass(D), []);
   typeParameters(reflectClass(E), ['S']);
   typeParameters(reflectClass(F), ['R']);
@@ skipping 98 matching lines @@
   currentMirrorSystem().libraries.values.forEach((libraryMirror) {
     libraryMirror.classes.values.forEach((classMirror) {
       // TODO(12282): Deal with generic typedefs.
       if (classMirror is! TypedefMirror) {
         Expect.isTrue(classMirror.isOriginalDeclaration);
         Expect.equals(classMirror, classMirror.originalDeclaration);
       }
     });
   });
 }