Remove a comment that says we can remove some obsolete code.
Remove a comment that says we can remove some obsolete code.

Spurred by Thiago's change in the area, I figured I'll try removing the PID symlink, but then I realized that this won't work, because the code currently gives precedence to the symlink, which means that if a server that writes both is replaced with a server that only writes the text file, the contents of the text file will not be read.

Also note that in Bazel, long jumps between server versions are much more possible than internally, so the cleanup is just not worth the risk, which is sad.

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MOS_MIGRATED_REVID=133820484

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