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

tests/compiler/dart2js/call_site_simple_type_inferer_test.dart

Index: tests/compiler/dart2js/call_site_simple_type_inferer_test.dart
diff --git a/tests/compiler/dart2js/call_site_simple_type_inferer_test.dart b/tests/compiler/dart2js/call_site_simple_type_inferer_test.dart
index 8ff09c7b52a140e112c7a0c05d97d239ab151993..d3fd545911fc57b8ce4bb79b5b877acc64755451 100644
--- a/tests/compiler/dart2js/call_site_simple_type_inferer_test.dart
+++ b/tests/compiler/dart2js/call_site_simple_type_inferer_test.dart
@@ -14,7 +14,7 @@ void compileAndFind(String code,
                     String memberName,
                     bool disableInlining,
                     check(compiler, element)) {
-  Uri uri = new Uri.fromComponents(scheme: 'source');
+  Uri uri = new Uri(scheme: 'source');
   var compiler = compilerFor(code, uri);
   compiler.disableInlining = disableInlining;
   compiler.runCompiler(uri);