Tighten types in test.dart even more.

tools/testing/dart/utils.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 utils;
 
 import 'dart:io';
 import 'dart:convert';
 
 import 'path.dart';
@@ skipping 162 matching lines @@
 
 // TODO(kustermann,ricow): As soon we have a debug log we should log
 // invalid utf8-encoded input to the log.
 // Currently invalid bytes will be replaced by a replacement character.
 String decodeUtf8(List<int> bytes) {
   return UTF8.decode(bytes, allowMalformed: true);
 }
 
 class Locations {
   static String getBrowserLocation(
-      String browserName, Map<String, String> globalConfiguration) {
-    var location = globalConfiguration[browserName];
+      String browserName, Map<String, dynamic> globalConfiguration) {
+    var location = globalConfiguration[browserName] as String;
     if (location != null && location != '') {
       return location;
     }
     var browserLocations = {
       'firefox': const {
         'windows': 'C:\\Program Files (x86)\\Mozilla Firefox\\firefox.exe',
         'linux': 'firefox',
         'macos': '/Applications/Firefox.app/Contents/MacOS/firefox'
       },
       'chrome': const {
@@ skipping 109 matching lines @@
 class UniqueObject {
   static int _nextId = 1;
   final int _hashCode;
 
   int get hashCode => _hashCode;
   operator ==(Object other) =>
       other is UniqueObject && _hashCode == other._hashCode;
 
   UniqueObject() : _hashCode = ++_nextId;
 }