Treat win8 machines as win10 ports and remove baseline/specifier support.

Tools/Scripts/webkitpy/layout_tests/port/factory_unittest.py

 # Copyright (C) 2010 Google Inc. All rights reserved.
 #
 # Redistribution and use in source and binary forms, with or without
 # modification, are permitted provided that the following conditions are
 # met:
 #
 #    * Redistributions of source code must retain the above copyright
 # notice, this list of conditions and the following disclaimer.
 #    * Redistributions in binary form must reproduce the above
 # copyright notice, this list of conditions and the following disclaimer
@@ skipping 56 matching lines @@
                          cls=linux.LinuxPort)
 
     def test_android(self):
         self.assert_port(port_name='android', cls=android.AndroidPort)
         # NOTE: We can't check for port_name=chromium here, as this will append the host's
         # operating system, whereas host!=target for Android.
 
     def test_win(self):
         self.assert_port(port_name='win-xp', cls=win.WinPort)
         self.assert_port(port_name='win-win7', cls=win.WinPort)
-        self.assert_port(port_name='win-win8', cls=win.WinPort)
         self.assert_port(port_name='win-win10', cls=win.WinPort)
         self.assert_port(port_name='win', os_name='win', os_version='xp',
                          cls=win.WinPort)
         self.assert_port(port_name='chromium', os_name='win', os_version='xp',
                          cls=win.WinPort)
 
     def test_unknown_specified(self):
         self.assertRaises(NotImplementedError, factory.PortFactory(MockSystemHost()).get, port_name='unknown')
 
     def test_unknown_default(self):
         self.assertRaises(NotImplementedError, factory.PortFactory(MockSystemHost(os_name='vms')).get)
 
     def test_get_from_builder_name(self):
         self.assertEqual(factory.PortFactory(MockSystemHost()).get_from_builder_name('WebKit Mac10.7').name(),
                           'mac-lion')