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This reverts commit 79e55e3e.

Reason for revert: Fix failed to land in time.

Original change's description:
> Add event cache size limit to media devtools
>
> This adds a cache for both total number of players as well as total
> number of events kept by the each individual player, in order to prevent
> long-living pages from creating an otherwise unbounded number of events
> and creating memory pressure.
>
> There is some logic for selecting which players to prune, but no logic
> to do anything special for events yet.
>
> Events, Messages, and Errors are all subject to the same cache size
> limits, but the Properties can't grow unbounded so they aren't.
>
> R=​dalecurtis
>
> Bug: 1145392
> Change-Id: Iab39207276b6179b9f8828df7ced210154ab97dc
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2517928
> Commit-Queue: Ted Meyer <tmathmeyer@chromium.org>
> Reviewed-by: Kent Tamura <tkent@chromium.org>
> Reviewed-by: Dale Curtis <dalecurtis@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#827070}

TBR=dalecurtis@chromium.org,caseq@chromium.org,tkent@chromium.org,tmathmeyer@chromium.org

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

Bug: 1145392
Change-Id: I40b2631948aadcb3643595681b222a5b6805a6dd
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2547403Reviewed-by: Dale Curtis <dalecurtis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#828775}