tools: removed unused members, tiny cleanup

tools/testing/dart/test_progress.dart

 // Copyright (c) 2013, 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_progress;
 
 import "dart:async";
 import "dart:io";
 import "dart:io" as io;
 import "dart:convert" show JSON;
@@ skipping 323 matching lines @@
     Duration d = (new DateTime.now()).difference(_startTime);
     print('\n--- Total time: ${_timeString(d)} ---');
     var outputs = _commandOutputs.toList();
     outputs.sort((a, b) {
       return b.time.inMilliseconds - a.time.inMilliseconds;
     });
     for (int i = 0; i < 20 && i < outputs.length; i++) {
       var commandOutput = outputs[i];
       var command = commandOutput.command;
       var testCases = _command2testCases[command];
-      var duration = commandOutput.time;
 
       var testCasesDescription = testCases.map((testCase) {
         return "${testCase.configurationString}/${testCase.displayName}";
       }).join(', ');
 
       print('${commandOutput.time} - '
             '${command.displayName} - '
             '$testCasesDescription');
     }
   }
@@ skipping 306 matching lines @@
       return new VerboseProgressIndicator(startTime);
     case 'status':
       return new ProgressIndicator(startTime);
     case 'buildbot':
       return new BuildbotProgressIndicator(startTime);
     default:
       assert(false);
       break;
   }
 }