Revert "Added incident report for variations seed signature mismatch."

Revert "Added incident report for variations seed signature mismatch."

> Added incident report for variations seed signature mismatch.
>
> - Keep record of a bad signature in VariationsSeedStore::LoadSeed.
> - Register VerifyVariationsSeedSignature in SafeBrowsingService::RegisterAllDelayedAnalysis to send an incident report, if a bad signature is encountered.
>
> BUG=423467
>
> Review URL: https://codereview.chromium.org/646733002
>
> Cr-Commit-Position: refs/heads/master@{#299964}

This reverts commit 37907039f034c6e39c2590fcfb49b7ce05a8b569 because it
accesses g_browser_process->variations_service() off of the main thread,
leading to a DCHECK.

BUG=423467
TBR=grt@chromium.org

Committed: https://crrev.com/1a35a28cc78e9646a649c90db606d919633709d4
Cr-Commit-Position: refs/heads/master@{#300479}

[grt (UTC plus 2), 2014-10-21 11:41:49]

grt@chromium.org changed reviewers:
+ georgesak@chromium.org

[grt (UTC plus 2), 2014-10-21 11:41:58]

The CQ bit was checked by grt@chromium.org

[commit-bot: I haz the power, 2014-10-21 11:46:21]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/664333002/1

[grt (UTC plus 2), 2014-10-21 11:49:50]

grt@chromium.org changed reviewers:
+ robertshield@chromium.org

[commit-bot: I haz the power, 2014-10-21 13:07:02]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2014-10-21 13:10:17]

Patchset 1 (id:??) landed as
https://crrev.com/1a35a28cc78e9646a649c90db606d919633709d4
Cr-Commit-Position: refs/heads/master@{#300479}