Extend dynamic top chrome flag

The feature is just default enabled in M125. Push the expiration so we have more time to do the clean up.

Change-Id: I025b4e658bad6580fbdc6a0c5f8a3994f07dcdb6
Fixed: 335052507
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5466543


Auto-Submit: Wenyu Fu <wenyufu@chromium.org>
Commit-Queue: Wenyu Fu <wenyufu@chromium.org>
Reviewed-by: Aishwarya Rajesh <aishwaryarj@google.com>
Commit-Queue: Aishwarya Rajesh <aishwaryarj@google.com>
Cr-Commit-Position: refs/heads/main@{#1289586}