Revert "Add crash keys to V4Store::VerifyChecksum"

This reverts commit 7a4e2300.

The crash has disappeared in M125, the same version with the crash
keys. So we're not going to be able to use them to understand the root
cause, and we're not going to need to investigate the crash any further.

Fixed: 331054795
Change-Id: Ia6ea61f6531788eeef43e1d4cfa4c8234c3080fc
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5684007


Reviewed-by: Kristian Monsen <kristianm@chromium.org>
Commit-Queue: Daniel Rubery <drubery@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1324401}