Tighten up a bunch of types in test.dart.

tools/testing/dart/test_configurations.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_configurations;
 
 import "dart:async";
 import 'dart:convert';
 import 'dart:io';
 import "dart:math" as math;
@@ skipping 84 matching lines @@
   }
 
   DebugLogger.init(
       firstConf['write_debug_log'] ? TestUtils.debugLogFilePath : null,
       append: firstConf['append_logs']);
 
   // Print the configurations being run by this execution of
   // test.dart. However, don't do it if the silent progress indicator
   // is used. This is only needed because of the junit tests.
   if (progressIndicator != 'silent') {
-    List output_words = configurations.length > 1
+    var outputWords = configurations.length > 1
         ? ['Test configurations:']
         : ['Test configuration:'];
     for (Map conf in configurations) {
       List settings = ['compiler', 'runtime', 'mode', 'arch']
           .map((name) => conf[name])
           .toList();
       if (conf['checked']) settings.add('checked');
       if (conf['strong']) settings.add('strong');
-      output_words.add(settings.join('_'));
+      outputWords.add(settings.join('_'));
     }
-    print(output_words.join(' '));
+    print(outputWords.join(' '));
   }
 
   var runningBrowserTests = configurations.any((config) {
     return TestUtils.isBrowserRuntime(config['runtime']);
   });
 
   List<Future> serverFutures = [];
-  var testSuites = new List<TestSuite>();
+  var testSuites = <TestSuite>[];
   var maxBrowserProcesses = maxProcesses;
   if (configurations.length > 1 &&
       (configurations[0]['test_server_port'] != 0 ||
           configurations[0]['test_server_cross_origin_port'] != 0)) {
     print("If the http server ports are specified, only one configuration"
         " may be run at a time");
     exit(1);
   }
   for (var conf in configurations) {
     Map<String, RegExp> selectors = conf['selectors'];
@@ skipping 172 matching lines @@
       maxBrowserProcesses,
       startTime,
       testSuites,
       eventListener,
       allTestsFinished,
       verbose,
       recordingPath,
       recordingOutputPath,
       adbDevicePool);
 }