Undo enforcing of PEP-8 pylint changes for method and function names.

The full reformat will take some time, let's postpone function and
method names.

Bug: webrtc:12114
Change-Id: I2b8f19fb257af20a254c28d34cee62a1a574bcd8
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/192380
Reviewed-by: Karl Wiberg <kwiberg@webrtc.org>
Commit-Queue: Mirko Bonadei <mbonadei@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#32576}

pylintrc

@@ -114,6 +114,24 @@ const-rgx=(([A-Z_][A-Z0-9_]*)|(__.*__))$
 # (CapWords)
 class-rgx=[A-Z_][a-zA-Z0-9]+$
 
+# Regular expression which should only match correct function names
+# The Chromium standard is different than PEP-8, so we need to redefine this to
+# only allow:
+# - CapWords
+# - main: Standard for main function.
+function-rgx=([A-Z_][a-zA-Z0-9]{2,60}|main)$
+
+# Regular expression which should only match correct method names
+# The Chromium standard is different than PEP-8, so we need to redefine this to
+# only allow:
+# - CapWords, starting with a capital letter.  No underscores in function
+#   names.  Can also have a "_" prefix (private method) or a "test" prefix
+#   (unit test).
+# - Methods that look like __xyz__, which are used to do things like
+#   __init__, __del__, etc.
+# - setUp, tearDown: For unit tests.
+method-rgx=((_|test)?[A-Z][a-zA-Z0-9]{2,60}|__[a-z]+__|setUp|tearDown)$
+
 # Regular expression which should only match correct instance attribute names
 attr-rgx=[a-z_][a-z0-9_]{2,30}$