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

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

 /*
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc. All rights reserved.
  * Copyright (C) 2010 Google Inc. All rights reserved.
  * Copyright (C) 2012 Samsung Electronics. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
@@ skipping 92 matching lines @@
     MouseEvent* mouseEvent = toMouseEvent(event->underlyingEvent());
     if (!mouseEvent->hasPosition())
         return IntPoint();
     return IntPoint(mouseEvent->offsetX(), mouseEvent->offsetY());
 }
 
 void ImageInputType::handleDOMActivateEvent(Event* event)
 {
     if (element().isDisabledFormControl() || !element().form())
         return;
-    element().setActivatedSubmit(true);
     m_clickLocation = extractClickLocation(event);
-    element().form()->prepareForSubmission(event); // Event handlers can run.
-    element().setActivatedSubmit(false);
+    element().form()->prepareForSubmission(event, &element()); // Event handlers can run.
     event->setDefaultHandled();
 }
 
 LayoutObject* ImageInputType::createLayoutObject(const ComputedStyle& style) const
 {
     if (m_useFallbackContent)
         return new LayoutBlockFlow(&element());
     LayoutImage* image = new LayoutImage(&element());
     image->setImageResource(LayoutImageResource::create());
     return image;
@@ skipping 160 matching lines @@
 
 PassRefPtr<ComputedStyle> ImageInputType::customStyleForLayoutObject(PassRefPtr<ComputedStyle> newStyle)
 {
     if (!m_useFallbackContent)
         return newStyle;
 
     return HTMLImageFallbackHelper::customStyleForAltText(element(), std::move(newStyle));
 }
 
 } // namespace blink