Allow the external protocol dialog to handle FORM_SUBMIT navigation

chrome/browser/chromeos/arc/arc_external_protocol_dialog.cc

Index: chrome/browser/chromeos/arc/arc_external_protocol_dialog.cc
diff --git a/chrome/browser/chromeos/arc/arc_external_protocol_dialog.cc b/chrome/browser/chromeos/arc/arc_external_protocol_dialog.cc
index a7a8f55eeb39ddc96b9a4486317944d51b6380d5..34205a92aaf0663defe1df8ad94da0849b1ef1e8 100644
--- a/chrome/browser/chromeos/arc/arc_external_protocol_dialog.cc
+++ b/chrome/browser/chromeos/arc/arc_external_protocol_dialog.cc
@@ -163,7 +163,9 @@ bool RunArcExternalProtocolDialog(const GURL& url,
                                   int routing_id,
                                   ui::PageTransition page_transition,
                                   bool has_user_gesture) {
-  if (ShouldIgnoreNavigation(page_transition))
+  // Try to forward <form> submissions to ARC when possible.
+  constexpr bool kAllowFormSubmit = true;
+  if (ShouldIgnoreNavigation(page_transition, kAllowFormSubmit))
     return false;
 
   mojom::IntentHelperInstance* intent_helper = GetIntentHelper();