Bring webdriver up to date with SDK changes, and a bit of refactoring.

pkg/pkg.status

 # 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.
 
 # Run this test manually to verify that the fixnum library produces
 # the same results as native ints on a set of directed and random inputs.
 # Skip it when running automated tests because it times out.  This
 # test only makes sense on runtimes that support 64-bit integer
 # arithmetic natively, i.e., the VM.
 fixnum/test/int_64_vm_test: Skip
 
 # Skip non-test files ending with "_test".
 scheduled_test/lib/*: Skip
 
+# WebDriver tests have 3rd party dependencies (we need to run
+# selenium_standalone.jar), so we skip these in our automated
+# testing.
+webdriver/test/webdriver_test: Skip
+
 [$compiler == dart2dart]
 *: Skip
 
 [ $system == macos ]
 scheduled_test/test/scheduled_test_test: Crash # Issue 9021
 
 # Don't compile tests that use dart:io to JS
 [ $compiler == dart2js || $compiler == dart2dart ]
 http/test/*: Skip
 oauth2/test/*: Skip
@@ skipping 70 matching lines @@
 *: Skip
 
 [ $arch == simarm ]
 *: Skip
 
 [ $arch == mips ]
 *: Skip
 
 [ $arch == simmips ]
 *: Skip