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 b6ebf18d794559a8bfc6d491916ebce04706faba..dcdcc070919b5386c606a65aee86a8e0d309f712 100644
--- a/tests/compiler/dart2js/resolver_test.dart
+++ b/tests/compiler/dart2js/resolver_test.dart
@@ -784,7 +784,7 @@ 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;