Do not set checked mode unconditionally for Dartium

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 449 matching lines @@
 
       String executable = getFilename(dumpRenderTreeFilename);
       List<String> args;
       if (component == 'webdriver') {
         // TODO(efortuna): These paths are not OS independent! 
         executable = '$dartDir/tools/testing/run_selenium.py';
         args = ['--out', htmlPath, '--browser', configuration['browser']];
       } else {
         args = ['--no-timeout'];
         if (component == 'dartium') {
-          var dartFlags = ['--enable_asserts',
-                           '--enable_type_checks',
-                           '--ignore-unrecognized-flags'];
+          var dartFlags = ['--ignore-unrecognized-flags'];
+          if (configuration["checked"]) {
+            dartFlags.add('--enable_asserts');
+            dartFlags.add("--enable_type_checks");
+          }
           dartFlags.addAll(vmOptions);
           args.add('--dart-flags=${Strings.join(dartFlags, " ")}');
         }
         args.add(htmlPath);
       }
       // Create BrowserTestCase and queue it.
       var testCase = new BrowserTestCase(
           testName,
           compilerExecutable,
           compilerArgs,
@@ skipping 551 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);
    }
 }