Merge services into a shared IOService in dart:io, and use a native port.

tests/standalone/io/file_test.dart

 // 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.
 //
 // Dart test program for testing file I/O.
 
 import 'dart:async';
 import 'dart:convert';
 import 'dart:collection';
 import 'dart:io';
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   }
 
   // Test for file write of different types of lists.
   static void testWriteVariousLists() {
     asyncTestStarted();
     final String fileName = "${tempDirectory.path}/testWriteVariousLists";
     final File file = new File(fileName);
     file.create().then((ignore) {
       file.open(mode: WRITE).then((RandomAccessFile openedFile) {
         // Write bytes from 0 to 7.
-        openedFile.writeFrom([0], 0, 1);
-        openedFile.writeFrom(const [1], 0, 1);
-        openedFile.writeFrom(new MyListOfOneElement(2), 0, 1);
+        openedFile.writeFromSync([0], 0, 1);
+        openedFile.writeFromSync(const [1], 0, 1);
+        openedFile.writeFromSync(new MyListOfOneElement(2), 0, 1);
         var x = 12345678901234567890123456789012345678901234567890;
         var y = 12345678901234567890123456789012345678901234567893;
-        openedFile.writeFrom([y - x], 0, 1);
-        openedFile.writeFrom([260], 0, 1);  // 260 = 256 + 4 = 0x104.
-        openedFile.writeFrom(const [261], 0, 1);
-        openedFile.writeFrom(new MyListOfOneElement(262), 0, 1);
+        openedFile.writeFromSync([y - x], 0, 1);
+        openedFile.writeFromSync([260], 0, 1);  // 260 = 256 + 4 = 0x104.
+        openedFile.writeFromSync(const [261], 0, 1);
+        openedFile.writeFromSync(new MyListOfOneElement(262), 0, 1);
         x = 12345678901234567890123456789012345678901234567890;
         y = 12345678901234567890123456789012345678901234568153;
         openedFile.writeFrom([y - x], 0, 1).then((ignore) {
           openedFile.close().then((ignore) {
             // Check the written bytes.
             final File file2 = new File(fileName);
             var openedFile2 = file2.openSync();
             var length = openedFile2.lengthSync();
             Expect.equals(8, length);
             List data = new List(length);
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       testRenameSync();
       testLastModified();
       asyncEnd();
     });
   }
 }
 
 main() {
   FileTest.testMain();
 }