Really though Apple and Microsoft need to both just accept that they lost the browser war and ship with Chrome or Firefox.
Code may be important, but it's not the only thing that matters. You could write the most beautiful, efficient, useful code in the world and it wouldn't matter if nobody ever saw it.
Besides, this is straying further and further from the point that Apple ships and maintains a web rendering engine as a core component of the system. It's so firmly embedded that it actually powers most text rendering on iOS. In light of this, saying Apple should discontinue their browser which is built upon this engine is preposterous.
By that standard UC Berkeley "created" BSD and Tim Berners-Lee "created" HTML.