This particular move takes something that is possible in web applications today and makes it not possible in the future (offline capable frontend-only applications), making the gap between native applications and browser applications further, so developers who need to build apps that works offline on iPhone, will only be able to use Apples own technologies for doing so, in a non-cross-platform way. Which in general, is what Apple always been favoring.
Google Docs doesn't really work offline, so it's not impacted by this change. Could also be a change of heart from Apple, since their stance on web applications have changed before.