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This change reverts WebRtcLoggingHandlerHost to being a ref-counted
class so its lifetime can be extended via PostTask. This allows the
class to finish its work after the tab or window is closed.

As part of this change, WebRtcLoggingHandlerHost is renamed to
WebRtcLoggingController since it is no longer a legacy IPC "host"
class. This new name better reflects its role in being the main class
used to control webrtc logging from the browser-side.

Bug: 989458
Change-Id: I9cbac4c93278e597e7a782cd79eb34550ded1c7e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1774052
Commit-Queue: Tommi <tommi@chromium.org>
Reviewed-by: Tommi <tommi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#691553}