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

tests/lib/mirrors/library_uri_io_test.dart

Index: tests/lib/mirrors/library_uri_io_test.dart
diff --git a/tests/lib/mirrors/library_uri_io_test.dart b/tests/lib/mirrors/library_uri_io_test.dart
index beddc4097575e9561799a06a4debb16839ac1a58..add283d7f5544c376b2d51a6adb35b1bf7cd950e 100644
--- a/tests/lib/mirrors/library_uri_io_test.dart
+++ b/tests/lib/mirrors/library_uri_io_test.dart
@@ -8,7 +8,6 @@ library MirrorsTest;
 
 import 'dart:mirrors';
 import 'dart:io';
-import 'dart:uri';
 import '../../../pkg/unittest/lib/unittest.dart';
 
 class Class {
@@ -25,7 +24,7 @@ main() {
   var mirrors = currentMirrorSystem();
   test("Test current library uri", () {
     String appendSlash(String path) => path.endsWith('/') ? path : '$path/';
-    Uri cwd = new Uri.fromComponents(
+    Uri cwd = new Uri(
         scheme: 'file',
         path: appendSlash(new Path(new File('.').fullPathSync()).toString()));
     Uri uri = cwd.resolve(new Path(new Options().script).toString());