Request that the browser close. The JavaScript 'onbeforeunload' event will
be fired. If |force_close| is false (0) the event handler, if any, will be
allowed to prompt the user and the user can optionally cancel the close.
If |force_close| is true (1) the prompt will not be displayed and the
close will proceed. Results in a call to
:do_close() if the event handler allows the close
or if |force_close| is true (1). See cef_life_span_handler_t::do_close()
documentation for additional usage information.
Request that the browser close. The JavaScript 'onbeforeunload' event will be fired. If |force_close| is false (0) the event handler, if any, will be allowed to prompt the user and the user can optionally cancel the close. If |force_close| is true (1) the prompt will not be displayed and the close will proceed. Results in a call to