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Trace Event used to be a single file, base/debug/trace_event.h. Then we
added more functionality, so it was base/debug/trace_event*.*
For many years, we have had per-file OWNERS for Trace Event based off
of trace_event*. This let us do trace_event improvements/iteration out
of band with the much slower base/OWNERS process.
But, this leads to a lot of poor filename choices for tracing related
features, specifically to fall under trace event reviewers instead of
base/ reviewers. That's clearly wrong.

BUG=451032

Review URL: https://codereview.chromium.org/837303004

Cr-Commit-Position: refs/heads/master@{#313266}