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This reverts commit 9d9ec179.

Reason for revert: https://crbug.com/1087096 -- crash in OnThermalStateChange on Mac ASAN GPU bots.

Original change's description:
> MediaStreamManager: listen to and log OnThermalStateChange
> 
> crrev.com/c/2195334 just landed PowerObserver::OnThermalStateChange,
> this CL listens to it from MediaStreamManager and logs it in the
> WebRTC log.
> 
> The utility function PowerMonitorSource::DeviceThermalStateToString
> gets #if DCHECK_IS_ON() removed to be used from the new code, which
> runs also in non-dcheck_always_on builds.
> 
> Bug: 1071431
> Change-Id: I5641ae5a96e4ca9504498821ffb3ea91adbec18a
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2207410
> Reviewed-by: François Doray <fdoray@chromium.org>
> Reviewed-by: Guido Urdaneta <guidou@chromium.org>
> Reviewed-by: Henrik Boström <hbos@chromium.org>
> Commit-Queue: Miguel Casas <mcasas@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#771045}

TBR=fdoray@chromium.org,mcasas@chromium.org,hbos@chromium.org,guidou@chromium.org,eshr@google.com

# Not skipping CQ checks because original CL landed > 1 day ago.

Bug: 1071431
Change-Id: I998eb902d70929171dacd12e7916159d47d6787a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2218477Reviewed-by: Robert Kroeger <rjkroege@chromium.org>
Commit-Queue: Robert Kroeger <rjkroege@chromium.org>
Auto-Submit: Robert Kroeger <rjkroege@chromium.org>
Cr-Commit-Position: refs/heads/master@{#772435}