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This reverts commit 022ed8ae.

Reason for revert: this broke Cast Audio bots, https://ci.chromium.org/buildbot/chromium.linux/Fuchsia%20ARM64%20Cast%20Audio/4367

Original change's description:
> RenderProcessHost exiting is an implicit PeerConnection removal
> 
> When a RenderProcessHost exits clearly or crashes, all of its
> PeerConnections should be considered as removed.
> 
> Bug: 775415, 805398, 808402
> Change-Id: I223e6e867758ef05d896608fbdcc3bc824238dd8
> Reviewed-on: https://chromium-review.googlesource.com/899348
> Commit-Queue: Elad Alon <eladalon@chromium.org>
> Reviewed-by: Guido Urdaneta <guidou@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#534840}

TBR=guidou@chromium.org,terelius@chromium.org,eladalon@chromium.org

Change-Id: I6f33dded2bba23f471c73495518fdded3ccbc3dc
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 775415, 805398, 808402
Reviewed-on: https://chromium-review.googlesource.com/905638Reviewed-by: Andrey Kosyakov <caseq@chromium.org>
Commit-Queue: Andrey Kosyakov <caseq@chromium.org>
Cr-Commit-Position: refs/heads/master@{#534845}