Merge the dart:uri library into dart:core and update the Uri class

tests/compiler/dart2js/simple_inferrer_closure_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.
 
 import 'package:expect/expect.dart';
 import 'compiler_helper.dart';
 
 const String TEST = """
 returnInt1() {
   var a = 42;
@@ skipping 62 matching lines @@
   returnInt2();
   returnDyn2();
   returnInt3();
   returnDyn3();
   returnInt4();
 }
 """;
 
 
 void main() {
-  Uri uri = new Uri.fromComponents(scheme: 'source');
+  Uri uri = new Uri(scheme: 'source');
   var compiler = compilerFor(TEST, uri);
   compiler.runCompiler(uri);
   var typesInferrer = compiler.typesTask.typesInferrer;
 
   checkReturn(String name, type) {
     var element = findElement(compiler, name);
     Expect.equals(type, typesInferrer.internal.returnTypeOf[element]);
   }
 
   checkReturn('returnInt1', typesInferrer.intType);
   // TODO(ngeoffray): We don't use types of mutated captured
   // variables anymore, because they could lead to optimistic results
   // needing to be re-analyzed.
   checkReturn('returnInt2', typesInferrer.dynamicType);
   checkReturn('returnInt3', typesInferrer.intType);
   checkReturn('returnInt4', typesInferrer.intType);
 
   checkReturn('returnDyn1', typesInferrer.dynamicType);
   checkReturn('returnDyn2', typesInferrer.dynamicType);
   checkReturn('returnDyn3', typesInferrer.dynamicType);
 }