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The following Python functions are directly involved in extracting .info
files from .aar:
* gn_helpers.py: ToGNString().
* aar.py: _IsManifestEmpty().
* aar.py: _CreateInfo().

We wish to port these files to Google3 to enable .info file extraction
(while keeping the Chromium versions around for verification). However,
these functions produce many Python lint warnings in Google3. This CL
fixes these warnings in Chromium first, and improve comments.

Change-Id: I2a826f70ac1d15f2f358195327fd0dd3f12db5fc
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2213206Reviewed-by: Andrew Grieve <agrieve@chromium.org>
Commit-Queue: Samuel Huang <huangs@chromium.org>
Cr-Commit-Position: refs/heads/master@{#771582}