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This replaces use of the deprecated WriteToFileNetLogObserver.
It has the advantage of moving file I/O off the calling thread.

Bug: 716570
Change-Id: Idac0cec3d1eb59fedc1793e2f60f9244d0324789
Reviewed-on: https://chromium-review.googlesource.com/564074Reviewed-by: Matt Menke <mmenke@chromium.org>
Reviewed-by: Luke Halliwell <halliwell@chromium.org>
Commit-Queue: Eric Roman <eroman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#485339}