Replace the configuration map with a typed object.

tools/testing/dart/launch_browser.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.
 
 /**
  * Simple command line interface to launching browsers.
  * Uses the browser_controller framework.
  * The usage is:
  *   DARTBIN launch_browser.dart BROWSER_NAME URL
  * DARTBIN should be the checked in stable binary.
  */
 
-import "browser_controller.dart";
-import "utils.dart";
+import 'browser_controller.dart';
+import 'configuration.dart';
 
 void printHelp() {
   print("Usage pattern:");
   print("launch_browser.dart browser url");
   print("Supported browsers: ${Browser.SUPPORTED_BROWSERS}");
 }
 
 void main(List<String> arguments) {
   if (arguments.length != 2) {
     print("Wrong number of arguments, please pass in exactly two arguments");
     printHelp();
     return;
   }
   var name = arguments[0];
 
   if (!Browser.supportedBrowser(name)) {
     print("Specified browser not supported");
     printHelp();
     return;
   }
 
-  var executable = Locations.getBrowserLocation(name, {});
-  var browser = new Browser.byName(name, executable);
+  var runtime = Runtime.find(name);
+  var configuration = new Configuration(runtime: runtime);
+  var executable = configuration.browserLocation;
+  var browser = new Browser.byRuntime(runtime, executable);
   browser.start(arguments[1]);
 }