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Revert of Set crash key if WM_QUIT message is received on GPU message loop. (patchset #3 id:40001 of https://codereview.chromium.org/2342713002/ )

Reason for revert:
We've got enough data now.

Original issue's description:
> Set crash key if WM_QUIT message is received on GPU message loop.
>
> Threads seem to be exiting unexpectedly, so to help debugging set a
> crash key if an unexpected WM_QUIT message is received.
>
> BUG=647068
> TBR=scottmg@chromium.org
>
> Committed: https://crrev.com/18db6b0cc6f81fba74278cfab2856ccb11c0e0c7
> Cr-Commit-Position: refs/heads/master@{#419057}

TBR=dcheng@chromium.org,scottmg@chromium.org,rsesek@chromium.org
# Not skipping CQ checks because original CL landed more than 1 days ago.
BUG=647068

Review-Url: https://codereview.chromium.org/2346353002
Cr-Commit-Position: refs/heads/master@{#419543}