Reviewed by Darin Adler.

        <rdar://problem/6950660> REGRESSION: iSale 5.5.3 crashes after I click a template to load

        Due to some subtle WebKit changes - presumably some delegate callback behavior - a latent bug in 
        iSale was uncovered where they aren't properly retaining their FrameLoadDelegate, and we ended up
        calling back to a dealloc'ed object.

        * WebView/WebView.mm:
        (-[WebView _needsAdobeFrameReloadingQuirk]): Use more intelligent C++-style initialization.
        (-[WebView _needsKeyboardEventDisambiguationQuirks]): Ditto.
        (-[WebView _needsFrameLoadDelegateRetainQuirk]): YES for iSale versions under 5.6
        (-[WebView dealloc]): Release the delegate if the quirk is in effect.
        (-[WebView setFrameLoadDelegate:]): Retain the new delegate if the quirk is in effect.



git-svn-id: http://svn.webkit.org/repository/webkit/trunk@45021 268f45cc-cd09-0410-ab3c-d52691b4dbfc