Remove getLastUsedRegularProfile from NewTabPageLayout.

Bug: 40254448
Change-Id: I7729663beb9b3beff25bd7a10d75fb29a15ba82d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5407358


Commit-Queue: Ted Choc <tedchoc@chromium.org>
Reviewed-by: Sky Malice <skym@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1280248}