I often wonder if Apple knew Google were working on their owner WebKit based browser? Safari was pretty pointless with the release of Chrome IMHO. It was never a very exciting browser.
Your question about the importance of developing Safari for Windows given that Chrome was in the works is interesting for this discussion, but your comments afterward seem out of place since they are about Safari as a whole.
I don't see how the existence of Chrome has any relevance to the creation of Safari as a whole. First, the timing might be off (I'll leave this for others to research.) More importantly, although I don't know exactly what the point of Safari was (presumably Apple wanted to have their own browser to include with the OS just like Microsoft did), I would have to think that if Chrome would satisfy that need then the latest Mozilla browser would have as well.
Apparently, Google, Apple, Nokia, and RIM all submit patches to the Webkit project. Google's contributions have surpassed Apple's in recent years..
Edit: I did a little more digging, and it looks like Chrome did start out as a (not very) secret project for a few years. I'm not sure when they started submitting their own patches to Webkit-core (as required by LGPL?), but they did maintain their own fork of webkit until 2009.
They're not required to submit patches, only release code to people you've distributed binaries to. So before Chrome was released, they didn't have to release anything.
> So before Chrome was released, they didn't have to release anything
They did. While LGPL doesn't mean you need to release all your project's code to users if they request it, it does mean you need to release any modifications of the parts covered by the LGPL.
They didn't have to release the changes in any way that made them easy to reintegrate with the mainline version, but they did have to release them somehow if requested to do so by a Chrome user.
Even the full GPL doesn't require you to automatically release your code back to the original source, it only states that you must provide the source to the people you distribute your product too if they request that you do.
Safari for Windows came out in summer of 2007, Google Chrome came out in September of 2008. Granted Chrome development started in 2006ish which was probably around the time Safari for Windows started. By the time Safari for windows was released those in the WebKit community knew Google was up to something, but didn't know a timetable, any details etc and from discussions they tossed out the first version so when Safari for Windows was released perhaps Google Chrome as we know it today was just starting. Looking at it from a business perspective or even just a 2006 perspective Apple's move makes a lot of sense.
Edit: Some of my memories are a bit fuzzy about what was going on exactly when in relation to everything else so feel free to correct any mistakes in the above.