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This CL updates the chromium_logger.h implementation with the changes in
https://github.com/google/leveldb/commit/7b945f200339aa47c24788d3ee9910c09c513843.

The CL also does minor cleanup in the Chromium port code.

Change-Id: I6ec4a464963bd0011ee01ea9879fda5d8836418e
Reviewed-on: https://chromium-review.googlesource.com/1205639Reviewed-by: Chris Mumford <cmumford@chromium.org>
Commit-Queue: Victor Costan <pwnall@chromium.org>
Cr-Commit-Position: refs/heads/master@{#590441}