- Allow nsIScriptContext::BindEventHandler to take a null void* handler argument, to remove the binding by nullifying it (for hyatt's XML-driven-key-mapping work). - Try to GetCompiledEventHandler (and if we don't, and compile it, Put too) for the load event and other non-deferred (XUL window-level) event listeners. - Improve doc comments and whitespace. git-svn-id: svn://10.0.0.236/trunk@55612 18797224-902f-48f8-a5cc-f745e15eee43