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This reverts commit 8e335edf.

Reason for revert:
Speculative revert for test failures on mac bots:
https://chromium-review.googlesource.com/c/chromium/src/+/1175051

I'll reland this if this is not relevant.

Original change's description:
> RemoteMacViews: Move DialogObserver to browser side
> 
> Move these from BridgedNativeWidget to BridgedNativeWidgetHostImpl.
> 
> Also move window BridgedNativeWidget::OnWindowWillClose callbacks
> from directly referencing NativeWidgetHost to going through the
> BridgedNativeWidgetHost interface (since they are responsible for
> removing BridgedNativeWidgetHostImpl as an observer now).
> 
> Separate out the interface that to BridgedNativeWidget that will be
> turned into a mojo interface and name it BridgedNativeWidgetPublic.
> These will be renamed to BridgedNativeWidgetImpl and
> BridgedNativeWidget in a search-and-replace patch soon.
> 
> Change-Id: I523aa8b3670b9432bde434af77ffd0e18a50f00e
> Reviewed-on: https://chromium-review.googlesource.com/1175238
> Commit-Queue: ccameron <ccameron@chromium.org>
> Reviewed-by: Elly Fong-Jones <ellyjones@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#583383}

TBR=ellyjones@chromium.org,ccameron@chromium.org

Change-Id: Ib4156fee617d8b80238a575e5d5524285a2a856e
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://chromium-review.googlesource.com/1177021Reviewed-by: Hiroki Nakagawa <nhiroki@chromium.org>
Commit-Queue: Hiroki Nakagawa <nhiroki@chromium.org>
Cr-Commit-Position: refs/heads/master@{#583502}