Remove backends.

tools/testing/dart/test_suite.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.
 
 /**
  * Classes and methods for enumerating and preparing tests.
  *
  * This library includes:
  *
  * - Creating tests by listing all the Dart files in certain directories,
@@ skipping 859 matching lines @@
 
   void activityCompleted() {
     if (--activityCount == 0) {
       directoryListingDone(true);
     }
   }
 
   String shellPath() => TestUtils.compilerPath(configuration);
 
   List<String> additionalOptions(String filename) {
-    filename = new File(filename).fullPathSync().replaceAll('\\', '/');
-    Directory tempDir = createOutputDirectory(filename, 'dartc-test');
-    return
-        [ '--fatal-warnings', '--fatal-type-errors',
-          '--out', tempDir.path];
+    return ['--fatal-warnings', '--fatal-type-errors'];
   }
 
   void processDirectory() {
     directoryPath = '$dartDir/$directoryPath';
     // Enqueueing the directory listers is an activity.
     activityStarted();
     for (String testDir in _testDirs) {
       Directory dir = new Directory("$directoryPath/$testDir");
       if (dir.existsSync()) {
         activityStarted();
@@ skipping 276 matching lines @@
  * $noCrash tests are expected to be flaky but not crash
  * $pass tests are expected to pass
  * $failOk tests are expected to fail that we won't fix
  * $fail tests are expected to fail that we should fix
  * $crash tests are expected to crash that we should fix
  * $timeout tests are allowed to timeout
 """;
     print(report);
    }
 }