Adjust types in SplayTree implementation and some strong tests to

tests/corelib_strong/sort_test.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.
 
 // Dart test for sort routines.
 library sort_test;
 
 import "package:expect/expect.dart";
 import 'sort_helper.dart';
 
 main() {
-  var compare = (a, b) => a.compareTo(b);
-  var sort = (list) => list.sort(compare);
+  var compare = (num a, num b) => a.compareTo(b);
+  var sort = (List<num> list) => list.sort(compare);
   new SortHelper(sort, compare).run();
 
-  compare = (a, b) => -a.compareTo(b);
+  compare = (num a, num b) => -a.compareTo(b);
   new SortHelper(sort, compare).run();
 
   var intCompare = (int a, int b) => a.compareTo(b);
 
   // Pivot-candidate indices: 7, 15, 22, 29, 37
   // Test Dutch flag partitioning (candidates 2 and 4 are the same).
   var list = [
     0,
     0,
     0,
@@ skipping 34 matching lines @@
     2 /**/,
     2,
     2,
     2,
     2,
     2,
     2,
     2
   ];
   list.sort(intCompare);
-  Expect.listEquals(list, [
+  Expect.listEquals(list, <int>[
     0,
     0,
     0,
     0,
     0,
     0,
     0,
     0,
     0,
     0,
@@ skipping 75 matching lines @@
     2 /**/,
     2,
     2,
     2,
     2,
     2,
     2,
     2
   ];
   list.sort(intCompare);
-  Expect.listEquals(list, [
+  Expect.listEquals(list, <int>[
     0,
     0,
     0,
     0,
     0,
     0,
     0,
     0,
     0,
     0,
@@ skipping 78 matching lines @@
     8 /**/,
     5,
     1,
     2,
     8,
     5,
     6,
     8
   ];
   list.sort(intCompare);
-  Expect.listEquals(list, [
+  Expect.listEquals(list, <int>[
     0,
     0,
     0,
     0,
     0,
     1,
     1,
     1,
     1,
     1,
@@ skipping 27 matching lines @@
     8,
     8,
     8,
     9,
     9,
     9,
     9,
     9
   ]);
 }