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

tests/compiler/dart2js/simple_inferrer_unregister_call_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 = """
@@ skipping 12 matching lines @@
 }
 
 main() {
   new A() + 42;
   foo();
 }
 """;
 
 
 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;
 
   checkReturnInClass(String className, String methodName, type) {
     var cls = findElement(compiler, className);
     var element = cls.lookupLocalMember(buildSourceString(methodName));
     Expect.equals(type, typesInferrer.internal.returnTypeOf[element]);
   }
 
   checkReturnInClass('A', '+', typesInferrer.intType);
 }