Revert "Harden ToolbarSnapshotState to check for nulls for visual hint checks."

This reverts commit 6bede87f.

Reason for revert: Causes CI failures crbug.com/1385357.

Original change's description:
> Harden ToolbarSnapshotState to check for nulls for visual hint checks.
>
> This also moves the assertion to the constructor to make it easier to see where the errors are being triggered.
>
> BUG=1383684
>
> Change-Id: I7cf0e4ff2c45791c622e519bd461523d824585e9
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4027036


> Reviewed-by: Sky Malice <skym@chromium.org>
> Commit-Queue: Ted Choc <tedchoc@chromium.org>
> Cr-Commit-Position: refs/heads/main@{#1071924}

Bug: 1383684
Fixed: 1385357
Change-Id: Ib9cc5c5ad0a4b229ed19c9b98a478978646778a6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4030358
Owners-Override: Victor Vianna <victorvianna@google.com>
Commit-Queue: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Bot-Commit: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Commit-Queue: Victor Vianna <victorvianna@google.com>
Auto-Submit: Victor Vianna <victorvianna@google.com>
Cr-Commit-Position: refs/heads/main@{#1072164}