Specify browser for timeouts test.
Specify browser for timeouts test.

staats-google/webdriver.dart,bwu-dart-contributing/webdriver.dart,bwu-dart-contributing/webdriver.dart,DrMarcII/webdriver.dart,DrMarcII/webdriver.dart,staats-google/webdriver.dart,DrMarcII/webdriver.dart,staats-google/webdriver.dart,DrMarcII/webdriver.dart,staats-google/webdriver.dart,google/webdriver.dart,bwu-dart-contributing/webdriver.dart,bwu-dart-contributing/webdriver.dart,google/webdriver.dart,google/webdriver.dart