Form submission with blank target is broken.

ios/web/web_state/ui/crw_web_controller.mm

Index: ios/web/web_state/ui/crw_web_controller.mm
diff --git a/ios/web/web_state/ui/crw_web_controller.mm b/ios/web/web_state/ui/crw_web_controller.mm
index c15eb0c28b87b3c90437e3146c956e359006209b..040d9fed2bc936a7b23b623fe3ec91bc1785d933 100644
--- a/ios/web/web_state/ui/crw_web_controller.mm
+++ b/ios/web/web_state/ui/crw_web_controller.mm
@@ -4215,7 +4215,7 @@ const NSTimeInterval kSnapshotOverlayTransition = 0.5;
       referrer.length ? GURL(base::SysNSStringToUTF8(referrer)) : _documentURL;
 
   WebState* childWebState = _webStateImpl->CreateNewWebState(
-      requestURL, openerURL, [self userIsInteracting]);
+      requestURL, openerURL, [self userClickedRecently]);

[Eugene But (OOO till 7-30), 2017/03/22 00:59:38]

This will allow more popups from malicious pages, so I would be very cautious
about this change. CL descriptions says that "window.open code expects that user
is still interacting with the page", but I don't think that's true.
|userIsInteracting| name is just misleading, it's not doing what it says :(

Current code seems to work correctly with window.open and target="_blank" links.
It does not work correctly with forms. Do you know what is the difference
between "form" case vs. "_blank" links f.e?

   if (!childWebState)
     return nil;