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

tests/compiler/dart2js/simple_inferrer_final_field_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';
 import 'parser_helper.dart';
 
 const String TEST = """
 
 class A {
   final intField;
   final giveUpField1;
   final giveUpField2;
   final fieldParameter;
   A() : intField = 42, giveUpField1 = 'foo', giveUpField2 = 'foo';
   A.bar() : intField = 54, giveUpField1 = 42, giveUpField2 = new A();
   A.foo(this.fieldParameter);
 }
 
 main() {
   new A();
   new A.bar();
   new A.foo(42);
 }
 """;
 
 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;
 
   checkFieldTypeInClass(String className, String fieldName, type) {
     var cls = findElement(compiler, className);
     var element = cls.lookupLocalMember(buildSourceString(fieldName));
     Expect.equals(type,
         typesInferrer.internal.typeOf[element].simplify(compiler));
   }
 
   checkFieldTypeInClass('A', 'intField', typesInferrer.intType);
   checkFieldTypeInClass('A', 'giveUpField1',
       findTypeMask(compiler, 'Interceptor', 'nonNullSubclass'));
   checkFieldTypeInClass('A', 'giveUpField2',
       typesInferrer.dynamicType.nonNullable());
   checkFieldTypeInClass('A', 'fieldParameter', typesInferrer.intType);
 }