Reviewed by Tim Hatcher.

    Reviewed by Tim Hatcher.

        - fix <rdar://problem/5513394> No way to detect Tiger vs Leopard from Safari's user agent string

        * WebView/WebView.mm:
        (callGestalt): Added.
        (createMacOSXVersionString): Added.
        (-[WebView _userAgentWithApplicationName:andWebKitVersion:]): Added Mac OS X version string,
        right after the string "Mac OS X", but with underscores instead of dots to avoid the dreaded
        "4." problem (old libraries that think a "4." anywhere in the user agent means Netscape 4).
        (-[WebView _userAgentForURL:]): Fixed incorrect bug numbers.

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@28499 268f45cc-cd09-0410-ab3c-d52691b4dbfc