 - decidePolicyForNavigationAction 
<NSURLRequest URL resources/do-nothing, main document URL resources/do-nothing, http method GET> is main frame - yes should open URLs externally - yes
 - decidePolicyForNavigationAction 
<NSURLRequest URL resources/notify-done.html, main document URL resources/notify-done.html, http method GET> is main frame - yes should open URLs externally - no