2.) WebShell now implements the new nsIScriptGlobalObjectOwner.
3.) WebShell supports GetInterface to nsIScriptGlobalObject.
4.) Documents no longer carry around a reference to nsIScriptContextOwner. Instead they hold on to a nsIScriptGlobalObject. nsIDocument::GetScriptContextOwner has now become nsIDocument::GetScriptGlobalObject(). Same change to the set methods.
git-svn-id: svn://10.0.0.236/trunk@55177 18797224-902f-48f8-a5cc-f745e15eee43
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