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NativeWidgetMac::CloseNow expects that the callbacks for window closure
will happen before the function exits. For out-of-process windows, this
will not be the case (and the callbacks will never be made because the
host interface will have been destroyed).

In out-of-process mode, add explicit calls to these callbacks.

This matches the behavior BridgedNativeWidgetHostImpl's
OnBridgeFactoryHostDestroying (which has the same problem where the
window destroy callbacks won't come in).

Bug: 915572
Change-Id: Ie65dfef1a7e483364ee95df2e52083c777523a61
Reviewed-on: https://chromium-review.googlesource.com/c/1388722
Commit-Queue: ccameron <ccameron@chromium.org>
Reviewed-by: Sidney San Martín <sdy@chromium.org>
Cr-Commit-Position: refs/heads/master@{#618682}