Try to fix iOS after last Pasteboard change.

        * platform/ios/PasteboardIOS.mm:
        (WebCore::Pasteboard::writeSelection): Put the new code inline here because the
        stringSelectionForPasteboard function is currently Mac-only.

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@151621 268f45cc-cd09-0410-ab3c-d52691b4dbfc