246a83fa36
In a follow-up I want to merge nsChildView.mm into nsCocoaWindow.mm, but I thought I'd send this for feedback. The most relevant changes: * Move members from nsChildView to nsCocoaWindow. * Manually position the ChildView* when custom titlebar is changed. * Deal with attaching directly to top level widget (mAttachedWidgetListener) like other platforms do. * On methods that are implemented in both nsChildView and nsCocoaWindow, look into which implementation we need (if one forwards to the other, pick the non-trivial one). * Some fix ups for code that lived in nsChildView that now needs to account for a client offset if there's a titlebar. Differential Revision: https://phabricator.services.mozilla.com/D245604
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