This is a non-standard extension in the first place and the variable name didn't make any sense too, so rename it to be standard-conforming and actually correspond to what it contains.
This ctor has more than one argument and so can't be used implicitly.
This is a squashed commit of the SOC2017_WEBVIEW_JS branch from https://github.com/joseeloren/wxWidgets.git Closes https://github.com/wxWidgets/wxWidgets/pull/538