Fixed test from r15080: use readAsStringSync instead of readAsTextSync

tests/standalone/io/skipping_dart2js_compilations_test.dart

 // Copyright (c) 2012, 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.
 
 #import("dart:io");
 #import("dart:isolate");
 #import("dart:uri");
 #import("../../../tools/testing/dart/test_suite.dart");
 #import("../../../tools/testing/dart/test_runner.dart");
 #import("../../../tools/testing/dart/test_options.dart");
@@ skipping 77 matching lines @@
 
   void _writeToFile(File file, String content) {
     if (content != null) {
       var fd = new File(file.fullPathSync()).openSync(FileMode.WRITE);
       fd.writeStringSync(content);
       fd.closeSync();
     }
   }
 
   String _readFile(File file) {
-    return file.readAsTextSync();
+    return file.readAsStringSync();
   }
 
   File _createFile(Path path) {
     var file = new File(path.toNativePath());
     file.createSync();
     return file;
   }
 }
 
 class TestCompletedHandler {
@@ skipping 82 matching lines @@
     runTest("fs_notUpToDate_snapshot", fs_notUpToDate_snapshot, true);
     runTest("fs_notUpToDate_dart", fs_notUpToDate_dart, true);
     // This is the only test where all dependencies are present and the test.js
     // file is newer than all the others. So we pass 'false' for shouldRun.
     runTest("fs_upToDate", fs_upToDate, false);
   }
   // We need to wait some time to make sure that the files we 'touch' get a 
   // bigger timestamp than the old ones
   new Timer(1000, touchFilesAndRunTests);
 }