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Pass the "is widget top level" parameter at BridgedNativeWidgetImpl init
rather than querying it from the NativeWidgetMac.

Remove the NativeWidgetMac member and accessor from
BridgedNativeWidgetImpl.

Move NativeWidgetMac::GetBridge[Host]ImplForNativeWindow to
BridgedNativeWidget[Host]Impl::GetFromNativeWindow (since there's no
reason to require going through NativeWidgetMac).

Change-Id: I1ed0753acc21dc45e8ed8fbe893b83e30c6abe34
Reviewed-on: https://chromium-review.googlesource.com/1217516
Commit-Queue: ccameron <ccameron@chromium.org>
Reviewed-by: Elly Fong-Jones <ellyjones@chromium.org>
Reviewed-by: Robert Sesek <rsesek@chromium.org>
Cr-Commit-Position: refs/heads/master@{#590463}