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

tests/compiler/dart2js/field_type_inferer_test.dart

 // Copyright (c) 2012, 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/js_backend/js_backend.dart';
 import '../../../sdk/lib/_internal/compiler/implementation/ssa/ssa.dart';
 import '../../../sdk/lib/_internal/compiler/implementation/scanner/scannerlib.dart';
 
 import 'compiler_helper.dart';
 import 'parser_helper.dart';
 
 void compileAndFind(String code,
                     String className,
                     String memberName,
                     bool disableInlining,
                     check(compiler, element)) {
-  Uri uri = new Uri.fromComponents(scheme: 'source');
+  Uri uri = new Uri(scheme: 'source');
   var compiler = compilerFor(code, uri);
   compiler.runCompiler(uri);
   compiler.disableInlining = disableInlining;
   var cls = findElement(compiler, className);
   var member = cls.lookupMember(buildSourceString(memberName));
   return check(compiler.backend, member);
 }
 
 const String TEST_1 = r"""
   class A {
@@ skipping 356 matching lines @@
                     'f2': HType.STRING,
                     'f3': HType.NON_NULL});
   runTest(TEST_19, {'f1': HType.UNKNOWN,
                     'f2': HType.UNKNOWN,
                     'f3': HType.UNKNOWN});
 }
 
 void main() {
   test();
 }