Remove duplicate entries in methods to diff and predicates to test

third_party/WebKit/Source/build/scripts/make_computed_style_base.py

Index: third_party/WebKit/Source/build/scripts/make_computed_style_base.py
diff --git a/third_party/WebKit/Source/build/scripts/make_computed_style_base.py b/third_party/WebKit/Source/build/scripts/make_computed_style_base.py
index 4daaaeb142f9893ff3d32238aeecf81bd2112bf7..ee79f1aa0c147a6d3bd262c10671145e89aaa26a 100755
--- a/third_party/WebKit/Source/build/scripts/make_computed_style_base.py
+++ b/third_party/WebKit/Source/build/scripts/make_computed_style_base.py
@@ -224,11 +224,13 @@ def _create_diff_groups(fields_to_diff, methods_to_diff, predicates_to_test, roo
                 diff_group.fields.append(field)
     for entry in methods_to_diff:
         for field in root_group.fields:
-            if not field.is_inherited_flag and field.property_name in entry['field_dependencies']:
+            if (not field.is_inherited_flag and field.property_name in entry['field_dependencies']
+                    and entry['method'] not in diff_group.expressions):
                 diff_group.expressions.append(entry['method'])
     for entry in predicates_to_test:
         for field in root_group.fields:
-            if not field.is_inherited_flag and field.property_name in entry['field_dependencies']:
+            if (not field.is_inherited_flag and field.property_name in entry['field_dependencies']
+                    and entry['predicate'] not in diff_group.predicates):
                 diff_group.predicates.append(entry['predicate'])
     return diff_group