Format all tests.

tests/corelib_strong/file_resource_test.dart

 // Copyright (c) 2015, 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";
 
 const sampleText = "Sample text file.";
 
 main() async {
   var file = await createFile();
@@ skipping 39 matching lines @@
   var tempDir = await Directory.systemTemp.createTemp("sample");
   var filePath = tempDir.path + Platform.pathSeparator + "sample.txt";
   var file = new File(filePath);
   await file.create();
   await file.writeAsString(sampleText);
   return file;
 }
 
 deleteFile(File file) async {
   // Removes the file and the temporary directory it's in.
-  var parentDir = new Directory(file.path.substring(0,
-                                file.path.lastIndexOf(Platform.pathSeparator)));
+  var parentDir = new Directory(
+      file.path.substring(0, file.path.lastIndexOf(Platform.pathSeparator)));
   await parentDir.delete(recursive: true);
 }