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

tests/compiler/dart2js/resolver_test.dart

Index: tests/compiler/dart2js/resolver_test.dart
diff --git a/tests/compiler/dart2js/resolver_test.dart b/tests/compiler/dart2js/resolver_test.dart
index a1d6ad3b9e0985e319d09d4c15c82448bba25a1d..453f6795a506479d77b2233497820b17d41c90c9 100644
--- a/tests/compiler/dart2js/resolver_test.dart
+++ b/tests/compiler/dart2js/resolver_test.dart
@@ -783,7 +783,7 @@ List<String> asSortedStrings(Link link) {
 }
 
 compileScript(String source) {
-  Uri uri = new Uri.fromComponents(scheme: 'source');
+  Uri uri = new Uri(scheme: 'source');
   MockCompiler compiler = compilerFor(source, uri);
   compiler.runCompiler(uri);
   return compiler;