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

third_party/WebKit/Source/core/loader/FormSubmission.cpp

 /*
  * Copyright (C) 2010 Google 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.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 144 matching lines @@
     , m_event(event)
 {
 }
 
 inline FormSubmission::FormSubmission(const String& result)
     : m_method(DialogMethod)
     , m_result(result)
 {
 }
 
-FormSubmission* FormSubmission::create(HTMLFormElement* form, const Attributes& attributes, Event* event)
+FormSubmission* FormSubmission::create(HTMLFormElement* form, const Attributes& attributes, Event* event, HTMLFormControlElement* submitButton)
 {
     DCHECK(form);
 
-    HTMLFormControlElement* submitButton = 0;
-    if (event && event->target()) {
-        for (Node* node = event->target()->toNode(); node; node = node->parentOrShadowHostNode()) {
-            if (node->isElementNode() && toElement(node)->isFormControlElement()) {
-                submitButton = toHTMLFormControlElement(node);
-                break;
-            }
-        }
-    }
-
     FormSubmission::Attributes copiedAttributes;
     copiedAttributes.copyFrom(attributes);
     if (submitButton) {
         AtomicString attributeValue;
         if (!(attributeValue = submitButton->fastGetAttribute(formactionAttr)).isNull())
             copiedAttributes.parseAction(attributeValue);
         if (!(attributeValue = submitButton->fastGetAttribute(formenctypeAttr)).isNull())
             copiedAttributes.updateEncodingType(attributeValue);
         if (!(attributeValue = submitButton->fastGetAttribute(formmethodAttr)).isNull())
             copiedAttributes.updateMethodType(attributeValue);
@@ skipping 24 matching lines @@
     if (copiedAttributes.method() == PostMethod) {
         isMultiPartForm = copiedAttributes.isMultiPartForm();
         if (isMultiPartForm && isMailtoForm) {
             encodingType = AtomicString("application/x-www-form-urlencoded");
             isMultiPartForm = false;
         }
     }
     WTF::TextEncoding dataEncoding = isMailtoForm ? UTF8Encoding() : FormDataEncoder::encodingFromAcceptCharset(copiedAttributes.acceptCharset(), document.encoding());
     FormData* domFormData = FormData::create(dataEncoding.encodingForFormSubmission());
 
+    if (submitButton)
+        submitButton->setActivatedSubmit(true);
     bool containsPasswordData = false;
     for (unsigned i = 0; i < form->associatedElements().size(); ++i) {
         FormAssociatedElement* control = form->associatedElements()[i];
         DCHECK(control);
         HTMLElement& element = toHTMLElement(*control);
         if (!element.isDisabledFormControl())
             control->appendToFormData(*domFormData);
         if (isHTMLInputElement(element)) {
             HTMLInputElement& input = toHTMLInputElement(element);
             if (input.type() == InputTypeNames::password && !input.value().isEmpty())
                 containsPasswordData = true;
         }
     }
+    if (submitButton)
+        submitButton->setActivatedSubmit(false);
 
     RefPtr<EncodedFormData> formData;
     String boundary;
 
     if (isMultiPartForm) {
         formData = domFormData->encodeMultiPartFormData();
         boundary = formData->boundary().data();
     } else {
         formData = domFormData->encodeFormData(attributes.method() == GetMethod ? EncodedFormData::FormURLEncoded : EncodedFormData::parseEncodingType(encodingType));
         if (copiedAttributes.method() == PostMethod && isMailtoForm) {
@@ skipping 45 matching lines @@
 
     frameRequest.resourceRequest().setURL(requestURL());
 
     frameRequest.setTriggeringEvent(m_event);
     frameRequest.setForm(m_form);
 
     return frameRequest;
 }
 
 } // namespace blink