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When using RemoteMacViews, for a given widget, the widget's NSWindow
and content NSView exist in the app shim process, while the tree of
AXPlatformNodeCocoas exists in the browser process.

In the browser process, the widget's NSWindow and content NSView are
represented by NSAccessibilityRemoteUIElements in
views::BridgedNativeWidgetHostImpl.

Update AXPlatformNodeDelegateMac::GetParent and GetNSWindow to retrieve
these values from views::BridgedNativeWidgetHostImpl.

In AXPlatformNodeDelegate, replace the method GetTopLevelWidget with
the method GetNSWindow and call this method in -[AXPlatformNodeCocoa
AXWindow]. Replace all subclass implementations except for
AXPlatformNodeDelegateMac with NOTREACHED.

Bug: 900846
Change-Id: Ia0d26c4d118391ce66cc1e080ca3b62fb228aa8c
Reviewed-on: https://chromium-review.googlesource.com/c/1338722
Commit-Queue: ccameron <ccameron@chromium.org>
Reviewed-by: Scott Violet <sky@chromium.org>
Reviewed-by: Elly Fong-Jones <ellyjones@chromium.org>
Reviewed-by: Dominic Mazzoni <dmazzoni@chromium.org>
Cr-Commit-Position: refs/heads/master@{#609959}