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

tests/compiler/dart2js/concrete_type_inference_test.dart

Index: tests/compiler/dart2js/concrete_type_inference_test.dart
diff --git a/tests/compiler/dart2js/concrete_type_inference_test.dart b/tests/compiler/dart2js/concrete_type_inference_test.dart
index 6a748c698c3f9de179c79a90b550da126836efd1..c8014422755744e6ad77b531e566aec8b981b782 100644
--- a/tests/compiler/dart2js/concrete_type_inference_test.dart
+++ b/tests/compiler/dart2js/concrete_type_inference_test.dart
@@ -8,7 +8,7 @@ import 'parser_helper.dart';
 
 void compileAndFind(String code, String name,
                     check(compiler, element)) {
-  Uri uri = new Uri.fromComponents(scheme: 'source');
+  Uri uri = new Uri(scheme: 'source');
   var compiler = compilerFor(code, uri);
   compiler.runCompiler(uri);
   var element = findElement(compiler, name);