Simplify platform specifier list added by w3c-test-autoroller.

third_party/WebKit/Tools/Scripts/webkitpy/w3c/update_w3c_test_expectations_unittest.py

Index: third_party/WebKit/Tools/Scripts/webkitpy/w3c/update_w3c_test_expectations_unittest.py
diff --git a/third_party/WebKit/Tools/Scripts/webkitpy/w3c/update_w3c_test_expectations_unittest.py b/third_party/WebKit/Tools/Scripts/webkitpy/w3c/update_w3c_test_expectations_unittest.py
index e3c1409db7f5dd759e633706e143636d501ac999..bb200c2adf516eb4b4f6b85c91e0bf090aa307d1 100644
--- a/third_party/WebKit/Tools/Scripts/webkitpy/w3c/update_w3c_test_expectations_unittest.py
+++ b/third_party/WebKit/Tools/Scripts/webkitpy/w3c/update_w3c_test_expectations_unittest.py
@@ -137,6 +137,18 @@ class UpdateW3CTestExpectationsTest(LoggingTestCase):
                 'crbug.com/test [ one ] external/fake/test/path.html [ Pass ]',
             ])
 
+    def test_create_line_list_all_platforms(self):
+        platforms = ('Trusty', 'Mac10.11', 'Mac10.10', 'Retina', 'Win7', 'Win10', 'Mac10.9')
+        results = {
+            'imported/fake/test/path.html': {
+                platforms: {'expected': 'PASS', 'actual': 'CRASH', 'bug': 'crbug.com/test'},
+            }
+        }
+        line_adder = W3CExpectationsLineAdder(self.host)
+        self.assertEqual(
+            line_adder.create_line_list(results),
+            ['crbug.com/test [ Mac10.10 Mac10.11 Mac10.9 Retina Trusty Win10 Win7 ] imported/fake/test/path.html [ Crash ]'])
+
     def test_merge_dicts_with_conflict_raise_exception(self):
         line_adder = W3CExpectationsLineAdder(self.host)
         # Both dicts here have the key "one", and the value is not equal.