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We cannot immediately destroy the context as JS code can still execute
after the iframe is removed. Instead we disconnect the context so that
new commands do nothing. Now, the context is not destroyed until all
WebGPU objects are GC'ed. A future change will improve this to tear down
the server GPU objects but keep the client context alive until GC.

Bug: 1160459
Change-Id: Iba58279a565d0099bf13420e1743003fc7c7aa23
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2613517
Auto-Submit: Austin Eng <enga@chromium.org>
Reviewed-by: Kai Ninomiya <kainino@chromium.org>
Reviewed-by: Corentin Wallez <cwallez@chromium.org>
Commit-Queue: Austin Eng <enga@chromium.org>
Cr-Commit-Position: refs/heads/master@{#845175}