[M148] Revert "[fixit] Make bookmark bar visible on custom NTPs"

Original change's description:
> Revert "[fixit] Make bookmark bar visible on custom NTPs"
>
> This reverts commit 1c9353d22624f0a689dd1956279da89cdbc4109d.
>
> Reason for revert: User feedback (crbug.com/510370818)
>
> Original change's description:
> > [fixit] Make bookmark bar visible on custom NTPs
> >
> > Bug: 491027414
> > Change-Id: I894fc33f75c298090b4b0bb5edcc50ec21e2f141
> > Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/7670040
> > Reviewed-by: Foromo Daniel Soromou <koretadaniel@chromium.org>
> > Reviewed-by: Kaan Alsan <alsan@chromium.org>
> > Reviewed-by: Christopher Grant <cjgrant@chromium.org>
> > Commit-Queue: Dmytro Yeroshkin <yeroshkin@chromium.org>
> > Reviewed-by: David Pennington <dpenning@chromium.org>
> > Cr-Commit-Position: refs/heads/main@{#1600583}
>
> Bug: 491027414
> Change-Id: Ida752b7998567a60c4c177c2e6e62e8be1a1252f
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/7837269
> Reviewed-by: Tibor Goldschwendt <tiborg@chromium.org>
> Reviewed-by: Foromo Daniel Soromou <koretadaniel@chromium.org>
> Commit-Queue: Dmytro Yeroshkin <yeroshkin@chromium.org>
> Cr-Commit-Position: refs/heads/main@{#1628808}

(cherry picked from commit 01e71df4e1d99410aea55f76cf8589c74bd686e1)

Bug: 512504985,491027414
Change-Id: Ida752b7998567a60c4c177c2e6e62e8be1a1252f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/7857449
Auto-Submit: chrome-cherry-picker@chops-service-accounts.iam.gserviceaccount.com <chrome-cherry-picker@chops-service-accounts.iam.gserviceaccount.com>
Bot-Commit: rubber-stamper@appspot.gserviceaccount.com <rubber-stamper@appspot.gserviceaccount.com>
Commit-Queue: Srinivas Sista <srinivassista@chromium.org>
Cr-Commit-Position: refs/branch-heads/7778@{#3196}
Cr-Branched-From: 77f495ee216d4c3cc784d33658bad4778c0680ee-refs/heads/main@{#1610480}