Issue #1873 - Part 2: Ensure normalized parent is used for UndisplayedMap handling code

We have four entry points that deal with the parents of display:none/ display:contents content. These are the functions for setting, changing, getting and removing a style context. Or more specifically:

GetStyleContextInMap called by GetDisplay[None|Contents]StyleFor

SetStyleContextInMap called by RegisterDisplay[None|Contents]StyleFor

ChangeStyleContextInMap called by ChangeRegisteredDisplay[None|Contents]StyleFor

UnregisterDisplay[None|Contents]StyleFor okay, this is actually two functions, but they act as a pair

This change makes all these functions call GetApplicableParent up front and act on and pass around the parent that it returns. This is so that throughout the code we are always handling the parent that will be used as the key in the UndisplayedMap entry. This is necessary so that all the code that sets/gets the 'MayHaveChildrenWithLayoutBoxesDisabled' bit on/from an nsIContent object is using the same object, otherwise everything breaks down.

Partially based on part 2 of https://bugzilla.mozilla.org/show_bug.cgi?id=1367214

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