submit() in submit event handler should not contains a value of a submit button.

third_party/WebKit/Source/core/html/forms/SubmitInputType.cpp

 /*
  * Copyright (C) 2010 Google Inc. All rights reserved.
  * Copyright (C) 2011 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
@@ skipping 48 matching lines @@
 
 bool SubmitInputType::supportsRequired() const
 {
     return false;
 }
 
 void SubmitInputType::handleDOMActivateEvent(Event* event)
 {
     if (element().isDisabledFormControl() || !element().form())
         return;
-    element().setActivatedSubmit(true);
-    element().form()->prepareForSubmission(event); // Event handlers can run.
-    element().setActivatedSubmit(false);
+    element().form()->prepareForSubmission(event, &element()); // Event handlers can run.
     event->setDefaultHandled();
 }
 
 bool SubmitInputType::canBeSuccessfulSubmitButton()
 {
     return true;
 }
 
 String SubmitInputType::defaultValue() const
 {
     return locale().queryString(WebLocalizedString::SubmitButtonDefaultLabel);
 }
 
 bool SubmitInputType::isTextButton() const
 {
     return true;
 }
 
 void SubmitInputType::valueAttributeChanged()
 {
     UseCounter::count(element().document(), UseCounter::InputTypeSubmitWithValue);
     BaseButtonInputType::valueAttributeChanged();
 }
 
 } // namespace blink