Revert of [Sync] Erase sync DB when corrupted (patchset #4 id:60001 of https://codereview.chromium.org/1082893003/)

Reason for revert:
Test fails on Win7 bots. see crbug.com/481895

Original issue's description:
> [Sync] Erase sync DB when corrupted
>
> Directory now registers to be notified of catastrophic sync DB errors.
> Upon notification, Directory triggers an unrecoverable sync error which
> causes ProfileSyncService to delete the sync DB.
>
> Add integration test that verifies the sync DB is deleted when DB
> corruption is detected.
>
> Remove unused member variable allow_failure_for_test_ from
> DirectoryBackingStore.
>
> Add MockUnrecoverableErrorHandler to assist in writing tests for
> Directory.
>
> BUG=470993
>
> Committed: https://crrev.com/90a7f8d3e3b3a2aac43e71a93eac2731f084945c
> Cr-Commit-Position: refs/heads/master@{#327120}

TBR=zea@chromium.org,pvalenzuela@chromium.org,maniscalco@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=470993

Review URL: https://codereview.chromium.org/1104423005

Cr-Commit-Position: refs/heads/master@{#327264}

0 files changed, 0 insertions, 0 deletions