fix all instances of "the the"

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 1592 matching lines @@
    *
    *     // DartOptions=--flag1 --flag2
    *
    *   - For tests that depend on compiling other files with dart2js (e.g.
    *   isolate tests that use multiple source scripts), you can specify
    *   additional files to compile using a comment too, as follows:
    *
    *     // OtherScripts=file1.dart file2.dart
    *
    *   - You can indicate whether a test is treated as a web-only test by
-   *   using an explicit import to a part of the the dart:html library:
+   *   using an explicit import to a part of the dart:html library:
    *
    *     import 'dart:html';
    *     import 'dart:web_audio';
    *     import 'dart:indexed_db';
    *     import 'dart:svg';
    *     import 'dart:web_sql';
    *
    *   Most tests are not web tests, but can (and will be) wrapped within
    *   another script file to test them also on browser environments (e.g.
    *   language and corelib tests are run this way). We deduce that if this
@@ skipping 828 matching lines @@
       for (var key in PATH_REPLACEMENTS.keys) {
         if (path.startsWith(key)) {
           path = path.replaceFirst(key, PATH_REPLACEMENTS[key]);
           break;
         }
       }
     }
     return path;
   }
 }