Bug 1464869 - Fix flake8/pep8 issue by hand in accessible/ r=glandium

MozReview-Commit-ID: 5hKo37QtOtz

--HG--
extra : rebase_source : e4f0854a8256cb9a35c153a9fe72f93bff424610

accessible/xpcom/AccEventGen.py

@@ -133,7 +133,7 @@ def print_cpp_file(fd, conf, incdirs):
 
     includes = []
     for e in conf.simple_events:
-        if not e in includes:
+        if e not in includes:
             includes.append(("nsIAccessible%s" % e))
 
     types = []