I have Chrome installed but don't want it as a default, this would just annoy the hell out of me.
It can't really even be for testing, since on iOS it's not like it's possible for Chrome to render any differently than in Safari!
Also, for some reason I can have many 10s of tabs open to pages on Safari (with a jailbreak tweak) whereas doing the same in a non-Safari browser causes a crash.
I'd probably use it for bookmark sync, too, but my bookmarks are such an unmanageable mess I usually just google stuff I need to find again. (Beyond a few very static bookmarks.)
One would assume that a developer would have this attached to an application setting.
Of course, too many settings are another problem...