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Hell, Emacs meets those requirements. I'm half-serious too: org-mode and Gnus are nice pieces of software that don't have anything to do with text editing per se.

There are a lot of cross-platform base libraries out there, many of them (like Qt, GTK/GLib, and Mozilla's stack) well-documented and well-supported. These systems are meant to be reused; Chrome? Not so much. Besides the buzz factor, why would you want to base a product on Chrome instead of one of the codebases designed to be used that way?