Split File into File and RandomAccessFile.

tests/standalone/src/FileInputStreamTest.dart

 // Copyright (c) 2011, 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 FileInputStream, VM-only, standalone test.
 
 // Helper method to be able to run the test from the runtime
 // directory, or the top directory.
 String getFilename(String path) =>
     new File(path).existsSync() ? path : '../' + path;
 
 void testStringInputStreamSync() {
   String fileName = getFilename("tests/standalone/src/readuntil_test.dat");
   // File contains "Hello Dart\nwassup!\n"
   File file = new File(fileName);
-  file.openSync();
   StringInputStream x = new StringInputStream(file.openInputStream());
   String line = x.readLine();
   Expect.equals("Hello Dart", line);
-  file.closeSync();
   line = x.readLine();
   Expect.equals("wassup!", line);
 }
 
 void testInputStreamAsync() {
   String fileName = getFilename("tests/standalone/src/readuntil_test.dat");
   // File contains "Hello Dart\nwassup!\n"
   var expected = "Hello Dart\nwassup!\n".charCodes();
-  File file = new File(fileName);
-  file.openSync();
-  InputStream x = file.openInputStream();
+  InputStream x = (new File(fileName)).openInputStream();
   var byteCount = 0;
   x.dataHandler = () {
     Expect.equals(expected[byteCount],  x.read(1)[0]);
     byteCount++;
   };
   x.closeHandler = () {
     Expect.equals(expected.length, byteCount);
   };
 }
 
 
 void testStringInputStreamAsync1() {
   String fileName = getFilename("tests/standalone/src/readuntil_test.dat");
   // File contains "Hello Dart\nwassup!\n"
   File file = new File(fileName);
-  file.openSync();
   StringInputStream x = new StringInputStream(file.openInputStream());
   var result = "";
   x.dataHandler = () {
     result += x.read();
   };
   x.closeHandler = () {
     Expect.equals("Hello Dart\nwassup!\n", result);
   };
 }
 
 
 void testStringInputStreamAsync2() {
   String fileName = getFilename("tests/standalone/src/readuntil_test.dat");
   // File contains "Hello Dart\nwassup!\n"
   File file = new File(fileName);
-  file.openSync();
   StringInputStream x = new StringInputStream(file.openInputStream());
   int lineCount = 0;
   x.lineHandler = () {
     var line = x.readLine();
     Expect.isTrue(lineCount == 0 || lineCount == 1);
     if (lineCount == 0) Expect.equals("Hello Dart", line);
     if (lineCount == 1) Expect.equals("wassup!", line);
     lineCount++;
   };
   x.closeHandler = () {
     Expect.equals(2, lineCount);
   };
 }
 
 
 void testChunkedInputStream() {
   String fileName = getFilename("tests/standalone/src/readuntil_test.dat");
   // File contains 19 bytes ("Hello Dart\nwassup!")
   File file = new File(fileName);
-  file.openSync();
   ChunkedInputStream x = new ChunkedInputStream(file.openInputStream());
   x.chunkSize = 9;
   List<int> chunk = x.read();
   Expect.equals(9, chunk.length);
-  file.closeSync();
   x.chunkSize = 5;
   chunk = x.read();
   Expect.equals(5, chunk.length);
   chunk = x.read();
   Expect.equals(5, chunk.length);
   chunk = x.read();
   Expect.equals(null, chunk);
 }
 
 
 main() {
   testStringInputStreamSync();
   testInputStreamAsync();
   testStringInputStreamAsync1();
   testStringInputStreamAsync2();
   testChunkedInputStream();
 }