Reformat webkitpy.layout_tests w/ format-webkitpy.

Tools/Scripts/webkitpy/layout_tests/controllers/repaint_overlay.py

 # Copyright 2014 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 import re
 
 
 def result_contains_repaint_rects(text):
     return isinstance(text, str) and (
-        re.search('"repaintRects": \[$', text, re.MULTILINE) != None or
+        re.search('"repaintRects": \[$', text, re.MULTILINE) is not None or
         text.find('Minimum repaint:') != -1)
 
 
 def extract_layer_tree(input_str):
     if not isinstance(input_str, str):
         return '{}'
 
     if input_str[0:2] == '{\n':
         start = 0
     else:
@@ skipping 179 matching lines @@
 setInterval(flip, 3000);
 </script>
 </body>
 </html>
 """ % {
         'title': test_name,
         'expected': expected_layer_tree,
         'actual': actual_layer_tree,
         'minimum_repaint': minimum_repaint,
     }