fix all instances of "the the"

tests/try/web/test_case.dart

 // Copyright (c) 2014, 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 trydart.test_case;
 
 import 'dart:html' show
     document;
 
 import 'dart:async';
@@ skipping 15 matching lines @@
  * test:
  *
  *   1. Run setup synchronously.
  *
  *   2. Schedule a new (async) Future which runs validate followed by the next
  *   test's setup.
  *
  *   3. Repeat step 2 until there are no more tests.
  *
  * The purpose of this test is to simulate edits (during setup), and then let
- * the the mutation observer to process the mutations followed by validation.
+ * the mutation observer to process the mutations followed by validation.
  */
 void runTests(List<TestCase> tests) {
   Completer completer = new Completer();
   asyncTest(() => completer.future.then((_) {
     // Clear the DOM to work around a bug in test.dart.
     document.body.nodes.clear();
   }));
 
   void iterateTests(Iterator<TestCase> iterator) {
     if (iterator.moveNext()) {
       TestCase test = iterator.current;
       print('${test.description}\nSetup.');
       test.setup();
       new Future(() {
         test.validate();
         print('${test.description}\nDone.');
         iterateTests(iterator);
       });
     } else {
       completer.complete(null);
     }
   }
 
   iterateTests(tests.iterator);
 }