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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}