Remove circular dependencies when logging. Fixes #737

[huangjeff5]

Description

This PR removes circular dependencies so that they do not cause strange output in the logs.

[google-cla]

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[googlebot]

We found a Contributor License Agreement for you (the sender of this pull request), but were unable to find agreements for all the commit author(s) or Co-authors. If you authored these, maybe you used a different email address in the git commits than was used to sign the CLA (login here to double check)? If these were authored by someone else, then they will need to sign a CLA as well, and confirm that they're okay with these being contributed to Google.
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[huangjeff5]

@mbleigh Heads up, this is the same as your old PR, except two changes:

• It looks like there was a small bug when binding the loggers: 8e08474
• Modify removeCircular to return a new object rather than mutate the original.

I created a new one because I don't have permission to push commits to the old PR.

[googlebot]

CLAs look good, thanks!

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