This reverts commit 87aae715.

Reason for revert: Speculative revert because of ASAN leaks in https://chromium-review.googlesource.com/584488

Original change's description:
> [inspector] support for cases when embedder doesn't call contextDestroyed
> 
> Node.js doesn't have good place to call contextDestroyed.
> We need to cleanup everything on our side to allow clients to not call
> contextDestroyed method.
> 
> R=​dgozman@chromium.org,eostroukhov@google.com
> 
> Bug: none
> Cq-Include-Trybots: master.tryserver.blink:linux_trusty_blink_rel;master.tryserver.chromium.linux:linux_chromium_rel_ng
> Change-Id: I6bfd4d6039f53eb994a2d20ecbca650744564e29
> Reviewed-on: https://chromium-review.googlesource.com/575519
> Reviewed-by: Dmitry Gozman <dgozman@chromium.org>
> Commit-Queue: Aleksey Kozyatinskiy <kozyatinskiy@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#46849}

TBR=dgozman@chromium.org,kozyatinskiy@chromium.org,eostroukhov@google.com,eostroukhov@chromium.org

Change-Id: Ic3c2764159f809536670f73ab0cd5ea37317d400
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: none
Cq-Include-Trybots: master.tryserver.blink:linux_trusty_blink_rel;master.tryserver.chromium.linux:linux_chromium_rel_ng
Reviewed-on: https://chromium-review.googlesource.com/584767Reviewed-by: Michael Hablich <hablich@chromium.org>
Commit-Queue: Michael Hablich <hablich@chromium.org>
Cr-Commit-Position: refs/heads/master@{#46865}