Run auto-formatter (autopep8) on webkitpy.

third_party/WebKit/Tools/Scripts/webkitpy/style/checkers/png.py

Index: third_party/WebKit/Tools/Scripts/webkitpy/style/checkers/png.py
diff --git a/third_party/WebKit/Tools/Scripts/webkitpy/style/checkers/png.py b/third_party/WebKit/Tools/Scripts/webkitpy/style/checkers/png.py
index 205e754a9c35baa7640009dd01ba793bd6d4c577..1a0ecab0165d6bb270d8d1ca32be7ed10cb8312a 100644
--- a/third_party/WebKit/Tools/Scripts/webkitpy/style/checkers/png.py
+++ b/third_party/WebKit/Tools/Scripts/webkitpy/style/checkers/png.py
@@ -31,6 +31,7 @@ from webkitpy.common import read_checksum_from_png
 from webkitpy.common.system.systemhost import SystemHost
 from webkitpy.common.checkout.scm.detection import SCMDetector
 
+
 class PNGChecker(object):
     """Check svn:mime-type for checking style"""
 
@@ -49,4 +50,5 @@ class PNGChecker(object):
         if self._fs.exists(self._file_path) and self._file_path.endswith("-expected.png"):
             with self._fs.open_binary_file_for_reading(self._file_path) as filehandle:
                 if not read_checksum_from_png.read_checksum(filehandle):
-                    self._handle_style_error(0, 'image/png', 5, "Image lacks a checksum. Generate pngs using run-webkit-tests to ensure they have a checksum.")
+                    self._handle_style_error(
+                        0, 'image/png', 5, "Image lacks a checksum. Generate pngs using run-webkit-tests to ensure they have a checksum.")