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

tests/compiler/dart2js/simple_inferrer_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
     '../../../sdk/lib/_internal/compiler/implementation/types/types.dart'
     show TypeMask;
 
 import 'compiler_helper.dart';
@@ skipping 439 matching lines @@
          ..returnInt4()
          ..returnInt5()
          ..returnInt6()
          ..returnInt7()
          ..returnInt8()
          ..returnInt9();
 }
 """;
 
 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].simplify(compiler),
         name);
@@ skipping 81 matching lines @@
   checkReturnInClass('B', 'returnInt9', typesInferrer.intType);
 
   checkFactoryConstructor(String className) {
     var cls = findElement(compiler, className);
     var element = cls.localLookup(buildSourceString(className));
     Expect.equals(new TypeMask.nonNullExact(cls.rawType),
                   typesInferrer.internal.returnTypeOf[element]);
   }
   checkFactoryConstructor('A');
 }