Do not self-dispose CefCallbackWrapper
Do not self-dispose CefCallbackWrapper

Because ResourceHandlerWrapper already takes care of this.  Fixes
AccessViolationException noted in #1143

dga711/CefSharp,NumbersInternational/CefSharp,rlmcneary2/CefSharp,ITGlobal/CefSharp,ITGlobal/CefSharp,Livit/CefSharp,VioletLife/CefSharp,rlmcneary2/CefSharp,NumbersInternational/CefSharp,illfang/CefSharp,ITGlobal/CefSharp,jamespearce2006/CefSharp,AJDev77/CefSharp,dga711/CefSharp,jamespearce2006/CefSharp,AJDev77/CefSharp,VioletLife/CefSharp,Haraguroicha/CefSharp,joshvera/CefSharp,dga711/CefSharp,ITGlobal/CefSharp,gregmartinhtc/CefSharp,haozhouxu/CefSharp,gregmartinhtc/CefSharp,jamespearce2006/CefSharp,gregmartinhtc/CefSharp,wangzheng888520/CefSharp,twxstar/CefSharp,Haraguroicha/CefSharp,wangzheng888520/CefSharp,joshvera/CefSharp,AJDev77/CefSharp,illfang/CefSharp,NumbersInternational/CefSharp,Haraguroicha/CefSharp,haozhouxu/CefSharp,AJDev77/CefSharp,wangzheng888520/CefSharp,rlmcneary2/CefSharp,Haraguroicha/CefSharp,illfang/CefSharp,joshvera/CefSharp,Livit/CefSharp,gregmartinhtc/CefSharp,illfang/CefSharp,wangzheng888520/CefSharp,NumbersInternational/CefSharp,Livit/CefSharp,twxstar/CefSharp,VioletLife/CefSharp,twxstar/CefSharp,jamespearce2006/CefSharp,joshvera/CefSharp,VioletLife/CefSharp,twxstar/CefSharp,haozhouxu/CefSharp,haozhouxu/CefSharp,jamespearce2006/CefSharp,Livit/CefSharp,dga711/CefSharp,Haraguroicha/CefSharp,rlmcneary2/CefSharp