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This CL moves the log_buffer.* implementation from browser/ to common/. This
allows the LogBuffer to be used for structures that live in common and in
the renderer.

Bug: 928595
Change-Id: Ib249f88c997a3669008efad1a99240fe6d0d2cbc
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1804299Reviewed-by: Vadym Doroshenko <dvadym@chromium.org>
Commit-Queue: Dominic Battré <battre@chromium.org>
Cr-Commit-Position: refs/heads/master@{#697159}