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This reverts commit 1537d629.

Reason for revert: potentially breaks gmail reloading when disabling offline mode with DevTools open.

Bug: 1085150

Original change's description:
> [DevTools] Properly notify devtools agent host when service worker is destroyed
> 
> ServiceWorkerDevToolsAgentHost now stores thread-safe reference to
> ServiceWorkerContextWrapper instead of ServiceWorkerContextCore that
> could be deleted asynchronously on the service worker core thread.
> 
> WorkerDestroyed notification is now sent to the observers of
> ServiceWorkerDevToolsManager iff the worker version is both stopped
> and doomed. Each worker can be terminated (and restarted) multiple times
> and will result in a sequence of targetCrashed/targetReloadedAfterCrash
> events in the protocol but the instance of its
> ServiceWorkerDevToolsAgentHost will survive restarts and all connected
> sessions will be preserved.
> 
> It fixes the events generated in the protocol for service workers from
> targetCreated, (detachedFromTarget, attachedToTarget, targetReloadedAfterCrash)* to
> targetCreated, (targetCrashed/targetReloadedAfterCrash)*, targetDestroyed
> and avoids inadvertent session terminations when workers are stopped and
> also spurious targetReloadedAfterCrash events.
> 
> Bug: none
> Change-Id: I1125604d08b7842f7f8d74751091193b9af2cb59
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2099590
> Commit-Queue: Yury Semikhatsky <yurys@chromium.org>
> Reviewed-by: Tsuyoshi Horo <horo@chromium.org>
> Reviewed-by: Dmitry Gozman <dgozman@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#750975}

TBR=dgozman@chromium.org,horo@chromium.org,caseq@chromium.org,yurys@chromium.org,einbinder@chromium.org

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

Bug: none
Change-Id: Ibba7ce840b8c8b73c32086d141005306591e21cc
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2213448Reviewed-by: Yury Semikhatsky <yurys@chromium.org>
Commit-Queue: Yury Semikhatsky <yurys@chromium.org>
Cr-Commit-Position: refs/heads/master@{#771365}