Revert changes in tools/testing, since we use the checked-in version for the testing scripts

tools/testing/dart/test_options.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.
 
 library test_options_parser;
 
 import "dart:io";
+import "dart:math";
 import "drt_updater.dart";
 import "test_suite.dart";
 
 List<String> defaultTestSelectors =
     const ['dartc', 'samples', 'standalone', 'corelib', 'co19', 'language',
            'isolate', 'vm', 'html', 'json', 'benchmark_smoke',
            'utils', 'lib', 'pkg'];
 
 /**
  * Specification of a single test option.
@@ skipping 123 matching lines @@
               'Timeout in seconds',
               ['-t', '--timeout'],
               [],
               -1,
               'int'),
           new _TestOptionSpecification(
               'progress',
               'Progress indication mode',
               ['-p', '--progress'],
               ['compact', 'color', 'line', 'verbose',
-               'silent', 'status', 'buildbot', 'diff'],
+               'silent', 'status', 'buildbot'],
               'compact'),
           new _TestOptionSpecification(
               'step_name',
               'Step name for use by -pbuildbot',
               ['--step_name'],
               [],
               null),
           new _TestOptionSpecification(
               'report',
               'Print a summary report of the number of tests, by expectation',
@@ skipping 198 matching lines @@
       }
       // Parse the value for the option.
       if (spec.type == 'bool') {
         if (!value.isEmpty) {
           print('No value expected for bool option $name');
           exit(1);
         }
         configuration[spec.name] = true;
       } else if (spec.type == 'int') {
         try {
-          configuration[spec.name] = int.parse(value);
+          configuration[spec.name] = parseInt(value);
         } catch (e) {
           print('Integer value expected for int option $name');
           exit(1);
         }
       } else {
         assert(spec.type == 'string');
         if (!spec.values.isEmpty) {
           for (var v in value.split(',')) {
             if (spec.values.lastIndexOf(v) == -1) {
               print('Unknown value ($v) for option $name');
@@ skipping 287 matching lines @@
         return option;
       }
     }
     print('Unknown test option $name');
     exit(1);
   }
 
 
   List<_TestOptionSpecification> _options;
 }