Turn on fatal warnings for compiler tests in the 'dartc' tests again

tools/testing/dart/test_suite.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("test_suite");
 
 #import("status_file_parser.dart");
 #import("test_runner.dart");
 #import("multitest.dart");
 
@@ skipping 713 matching lines @@
   }
 
   String shellPath() => TestUtils.compilerPath(configuration);
 
   List<String> additionalOptions() {
     // TODO(ager): potentially register cleanup action to delete the temporary
     // directories?
     var tempDir = new Directory('');
     tempDir.createTempSync();
     return
-        ['-check-only', '-fatal-type-errors', '-Werror', '-out', tempDir.path];
+        [ '--fatal-warnings', '--fatal-type-errors', 
+          '-check-only', '-out', tempDir.path];
   }
 
   void processDirectory() {
     directoryPath = getDirname(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 269 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);
    }
 }