Change all File APIs to make the mode and encoding arguments named

tests/standalone/io/file_write_as_test.dart

Index: tests/standalone/io/file_write_as_test.dart
diff --git a/tests/standalone/io/file_write_as_test.dart b/tests/standalone/io/file_write_as_test.dart
index fd53f07455c1d39a937d033410376272a72f732b..1932b707612cd77c49caf8f79d5fb79af6025aa6 100644
--- a/tests/standalone/io/file_write_as_test.dart
+++ b/tests/standalone/io/file_write_as_test.dart
@@ -1,4 +1,4 @@
-// Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
+// Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
@@ -11,7 +11,7 @@ testWriteAsBytesSync(dir) {
   var data = [50,50,50];
   f.writeAsBytesSync(data);
   Expect.listEquals(data, f.readAsBytesSync());
-  f.writeAsBytesSync(data, FileMode.APPEND);
+  f.writeAsBytesSync(data, mode: FileMode.APPEND);
   var expected = [50, 50, 50, 50, 50, 50];
   Expect.listEquals(expected, f.readAsBytesSync());
 }
@@ -33,7 +33,7 @@ Future testWriteAsBytes(dir) {
     Expect.equals(f, file);
     f.readAsBytes().then((bytes) {
       Expect.listEquals(data, bytes);
-      f.writeAsBytes(data, FileMode.APPEND).then((file) {
+      f.writeAsBytes(data, mode: FileMode.APPEND).then((file) {
         Expect.equals(f, file);
         f.readAsBytes().then((bytes) {
           var expected = [50, 50, 50, 50, 50, 50];