Update pylintrc to match Chromium style guide.
Update pylintrc to match Chromium style guide.

According to [1], the Chromium Python Style Guide has changed and it
is not requiring any custom change compared to PEP-8.

This CL removes the exceptions from pylintrc.

[1] - https://chromium.googlesource.com/chromium/src/+/master/styleguide/python/python.md#our-previous-python-style

Bug: None
Change-Id: I2c8c8ab20536a4bea094dfa658c9c8391ea30251
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/186664
Reviewed-by: Karl Wiberg <2c708eb0a58047bf403399f50b3da33ffd2dd444@webrtc.org>
Commit-Queue: Mirko Bonadei <d2c43c210eae6feef04f53bae50885e8152edcca@webrtc.org>
Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#32339}

TimothyGu/libilbc,TimothyGu/libilbc,ShiftMediaProject/libilbc,ShiftMediaProject/libilbc,ShiftMediaProject/libilbc,TimothyGu/libilbc,ShiftMediaProject/libilbc,ShiftMediaProject/libilbc,TimothyGu/libilbc,TimothyGu/libilbc