fix virtual_test_suites() for browser_test ports

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

Index: Tools/Scripts/webkitpy/layout_tests/port/browser_test_unittest.py
diff --git a/Tools/Scripts/webkitpy/layout_tests/port/browser_test_unittest.py b/Tools/Scripts/webkitpy/layout_tests/port/browser_test_unittest.py
index f357e8db715bc2caaeee0faf6cb6edd759dfb4f6..b37157e8d1d8882e27a0ea42cbcb35f99d2d5580 100644
--- a/Tools/Scripts/webkitpy/layout_tests/port/browser_test_unittest.py
+++ b/Tools/Scripts/webkitpy/layout_tests/port/browser_test_unittest.py
@@ -29,6 +29,7 @@
 import unittest
 
 from webkitpy.common.system.executive_mock import MockExecutive2
+from webkitpy.common.system.systemhost import SystemHost
 from webkitpy.common.system.systemhost_mock import MockSystemHost
 from webkitpy.tool.mocktool import MockOptions
 
@@ -85,6 +86,11 @@ class BrowserTestWinTest(port_testcase.PortTestCase):
         self.assertEqual(self.make_port(options=MockOptions(configuration='Release')).default_timeout_ms(), 20000)
         self.assertEqual(self.make_port(options=MockOptions(configuration='Debug')).default_timeout_ms(), 60000)
 
+    def test_virtual_test_suites(self):
+        # We override this test to ensure that we're passing a full port name (and hence can run
+        # the test on all platforms).
+        port = self.make_port(host=SystemHost(), port_name='win-win7')
+
 
 class BrowserTestMacTest(port_testcase.PortTestCase):
     os_name = 'mac'