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This reverts commit 0ee09a04.

Reason for revert: Regresses Assistant UI.

Original change's description:
> views: removal of dead code in NativeViewHost
>
> NativeViewHost has code to deal with being clipped by an ancestor. This logic
> dates back to when we used NativeViewHost more often, and in particular when
> NativeViewHost was contained in a ScrollView. AFAIK we no longer have this
> scenario, so, this removes the unnecessary logic.
>
> BUG=none
> TEST=covered by tests
>
> Change-Id: I7b1a9ba047bd7c4abab68f9fe49c651bf50209d2
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1560130
> Commit-Queue: Scott Violet <sky@chromium.org>
> Reviewed-by: Michael Wasserman <msw@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#649355}

TBR=sky@chromium.org,msw@chromium.org

# Not skipping CQ checks because original CL landed > 1 day ago.

Bug: b:130305523
Change-Id: Ib0b5dba24bb4e376f3cdad11d19d59e318fd1b2e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1563031Reviewed-by: Scott Violet <sky@chromium.org>
Commit-Queue: David Black <dmblack@google.com>
Cr-Commit-Position: refs/heads/master@{#649775}