 - decidePolicyForNavigationAction 
<NSURLRequest URL resources/window-open-to-notify-done-from-subframe.html, main document URL resources/window-open-to-notify-done-from-subframe.html, http method GET> is main frame - yes should open URLs externally - no
 - decidePolicyForNavigationAction 
<NSURLRequest URL window-open-to-notify-done.html, main document URL window-open-to-notify-done-from-subframe.html, http method GET> is main frame - no should open URLs externally - no
 - decidePolicyForNavigationAction 
<NSURLRequest URL notify-done.html, main document URL notify-done.html, http method GET> is main frame - yes should open URLs externally - no