Revert of Add crash instrumentation for crbug.com/621147 (patchset #1 id:1 of https://codereview.chromium.org/2114743002/ )

Reason for revert:
Bug found and fixed: crrev.com/7614362b

Instrumentation no longer needed.

Original issue's description:
> Add crash instrumentation for crbug.com/621147
>
> BUG=chromium:621147
> LOG=N
> R=ishell@chromium.org,cbruni@chromium.org
>
> Committed: https://crrev.com/5ff508a82299f20a0d9828cf73072a4f4772fab8
> Cr-Commit-Position: refs/heads/master@{#37328}

TBR=verwaest@chromium.org,cbruni@chromium.org,ishell@chromium.org,mlippautz@chromium.org,adamk@chromium.org
BUG=chromium:621147, chromium:624764

Review-Url: https://codereview.chromium.org/2127813002
Cr-Commit-Position: refs/heads/master@{#37552}