Revert "Add fieldtrial config for the MinorModeRestrictionsForHistorySyncOptInIos"

This reverts commit 6d6fc796def34f26512316dd7e4d7bdebb739ee0.

Reason for revert: too many tests failing

Original change's description:
> Add fieldtrial config for the MinorModeRestrictionsForHistorySyncOptInIos
>
> Bug: b:324633884
> Change-Id: I376e51b4ec9c9447a64b96110946af9cbc7e2ff8
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5299736
> Commit-Queue: James Lee <ljjlee@google.com>
> Reviewed-by: James Lee <ljjlee@google.com>
> Auto-Submit: Tomek Jurkiewicz <tju@google.com>
> Cr-Commit-Position: refs/heads/main@{#1261205}

Bug: b:324633884
Change-Id: I7d561d1f157e2d34d8d5e2d4326c3f8efac6a01d
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5300261
Bot-Commit: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Reviewed-by: James Lee <ljjlee@google.com>
Commit-Queue: James Lee <ljjlee@google.com>
Cr-Commit-Position: refs/heads/main@{#1261645}