webkitpy: Reduce usage of path_from_webkit_base().

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

Index: third_party/WebKit/Tools/Scripts/webkitpy/style/checkers/python.py
diff --git a/third_party/WebKit/Tools/Scripts/webkitpy/style/checkers/python.py b/third_party/WebKit/Tools/Scripts/webkitpy/style/checkers/python.py
index 365d427871f0e23b693867c8fb363e31a499c31c..475be320a04fe0c06378cea345c06b656a4e0b5d 100644
--- a/third_party/WebKit/Tools/Scripts/webkitpy/style/checkers/python.py
+++ b/third_party/WebKit/Tools/Scripts/webkitpy/style/checkers/python.py
@@ -76,10 +76,10 @@ class PythonChecker(object):
         executive = Executive()
         env = os.environ.copy()
         env['PYTHONPATH'] = os.pathsep.join([
-            wkf.path_from_webkit_base('Tools', 'Scripts'),
-            wkf.path_from_webkit_base('Source', 'build', 'scripts'),
-            wkf.path_from_webkit_base('Tools', 'Scripts', 'webkitpy', 'thirdparty'),
-            wkf.path_from_webkit_base('Source', 'bindings', 'scripts'),
+            wkf.path_from_tools_scripts(),
+            wkf.path_from_blink_source('build', 'scripts'),
+            wkf.path_from_tools_scripts('webkitpy', 'thirdparty'),
+            wkf.path_from_blink_source('bindings', 'scripts'),
             wkf.path_from_chromium_base('build', 'android'),
             wkf.path_from_chromium_base('third_party', 'catapult', 'devil'),
             wkf.path_from_chromium_base('third_party', 'pymock'),