Require domino 1.0.9; remove hacks needed for 1.0.8.  Fixes #45993.

Our hack added a Node.outerHTML property which isn't actually in the DOM
spec (or in domino 1.0.9 upstream).  Emulate it in Util.serializeNode()
so that #text and #comment nodes can still be serialized.

Change-Id: I17b5bb0b720d31b8436db39f5990e28a887d0ba0
Merge "Require domino 1.0.9; remove hacks needed for 1.0.8.  Fixes #45993."