cleanup to tools/testing/dart

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";
-
-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);
-  browser.start(arguments[1]);
-}