* UUIInteractionHandler still needs to implement XInitialization.
* Moved ambiguating InteractionHandler typedef out of the way.
* Removed InteractionHandler.createDefault, as it was originally stated that "it
is strongly recommended that [the "Parent"] property is supplied."
* Added back documentation about Parent and Context.
* Simplified some call-sites to directly use XInteractionHandler2.
Change-Id: I1029b8f3cf079171c75920cafaaa44b5bbada883