Split File into File and RandomAccessFile.

frog/leg/scanner/vm_scanner_bench.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.
 
 #library('vm_scanner_bench');
 #import('scannerlib.dart');
 #import('scanner_implementation.dart');
 #import('scanner_bench.dart');
 #source('byte_strings.dart');
 #source('byte_array_scanner.dart');
 
 class VmScannerBench extends ScannerBench {
   int getBytes(String filename, void callback(List<int> bytes)) {
-    File file = new File(filename);
-    file.openSync();
+    File file = (new File(filename)).openSync();
     int size = file.lengthSync();
     List<int> bytes = new List<int>(size + 1);
     file.readListSync(bytes, 0, size);
     bytes[size] = $EOF;
     file.closeSync();
     callback(bytes);
     return bytes.length - 1;
   }
 
   void checkExistence(String filename) {
     File file = new File(filename);
     if (!file.existsSync()) {
       print("no such file: ${filename}");
     }
   }
 
   Scanner makeScanner(bytes) => new ByteArrayScanner(bytes);
 }
 
 main() {
   new VmScannerBench().main(argv);
 }