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

tests/standalone/io/file_input_stream_test.dart

-// 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.
 // Testing file input stream, VM-only, standalone test.
 
 import "dart:io";
 import "dart:isolate";
 
 // Helper method to be able to run the test from the runtime
 // directory, or the top directory.
 String getFilename(String path) =>
@@ skipping 58 matching lines @@
   // Start streaming the file. Pause after first chunk. Truncate
   // underlying file and check that the streaming stops with or
   // without getting all data.
   var streamedBytes = 0;
   var subscription;
   subscription = file.openRead().listen(
       (d) {
         if (streamedBytes == 0) {
           subscription.pause();
           // Truncate the file by opening it for writing.
-          file.open(FileMode.WRITE).then((opened) {
+          file.open(mode: FileMode.WRITE).then((opened) {
             opened.close().then((_) {
                 Expect.equals(0, file.lengthSync());
                 subscription.resume();
             });
           });
         }
         streamedBytes += d.length;
       },
       onDone: () {
         Expect.isTrue(streamedBytes > 0 && streamedBytes <= originalLength);
@@ skipping 52 matching lines @@
   // Start streaming the file. Pause after first chunk. Append to
   // underlying file and check that the stream gets all the data.
   var streamedBytes = 0;
   var subscription;
   subscription = file.openRead().listen(
       (d) {
         if (streamedBytes == 0) {
           subscription.pause();
           // Double the length of the underlying file.
           file.readAsBytes().then((bytes) {
-            file.writeAsBytes(bytes, FileMode.APPEND).then((_) {
+            file.writeAsBytes(bytes, mode: FileMode.APPEND).then((_) {
               Expect.equals(2 * originalLength, file.lengthSync());
               subscription.resume();
             });
           });
         }
         streamedBytes += d.length;
       },
       onDone: () {
         Expect.equals(2 * originalLength, streamedBytes);
         temp.delete(recursive: true).then((_) => keepAlive.close());
@@ skipping 32 matching lines @@
   testOpenStreamAsync();
   testInputStreamTruncate();
   testInputStreamDelete();
   testInputStreamAppend();
   // Check the length of these files as both are text files where one
   // is without a terminating line separator which can easily be added
   // back if accidentally opened in a text editor.
   testStringLineTransformerEnding("readline_test1.dat", 111);
   testStringLineTransformerEnding("readline_test2.dat", 114);
 }