Fix formAction return value for empty formaction content attribute.

Source/core/html/HTMLFormControlElement.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2007 Apple Inc. All rights reserved.
  *           (C) 2006 Alexey Proskuryakov (ap@nypop.com)
  *
  * 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
@@ skipping 16 matching lines @@
 
 #include "core/dom/ElementTraversal.h"
 #include "core/events/Event.h"
 #include "core/frame/UseCounter.h"
 #include "core/html/HTMLDataListElement.h"
 #include "core/html/HTMLFieldSetElement.h"
 #include "core/html/HTMLFormElement.h"
 #include "core/html/HTMLInputElement.h"
 #include "core/html/HTMLLegendElement.h"
 #include "core/html/ValidityState.h"
+#include "core/html/parser/HTMLParserIdioms.h"
 #include "core/inspector/ConsoleMessage.h"
 #include "core/layout/LayoutBox.h"
 #include "core/layout/LayoutTheme.h"
 #include "core/page/Page.h"
 #include "core/page/ValidationMessageClient.h"
 #include "platform/text/BidiTextRun.h"
 #include "wtf/Vector.h"
 
 namespace blink {
 
@@ skipping 31 matching lines @@
     setForm(0);
 #endif
 }
 
 DEFINE_TRACE(HTMLFormControlElement)
 {
     FormAssociatedElement::trace(visitor);
     LabelableElement::trace(visitor);
 }
 
+String HTMLFormControlElement::formAction() const
+{
+    const AtomicString& action = fastGetAttribute(formactionAttr);
+    if (action.isEmpty())
+        return document().url();
+    return document().completeURL(stripLeadingAndTrailingHTMLSpaces(action));
+}
+
+void HTMLFormControlElement::setFormAction(const AtomicString& value)
+{
+    setAttribute(formactionAttr, value);
+}
+
 String HTMLFormControlElement::formEnctype() const
 {
     const AtomicString& formEnctypeAttr = fastGetAttribute(formenctypeAttr);
     if (formEnctypeAttr.isNull())
         return emptyString();
     return FormSubmission::Attributes::parseEncodingType(formEnctypeAttr);
 }
 
 void HTMLFormControlElement::setFormEnctype(const AtomicString& value)
 {
@@ skipping 550 matching lines @@
         dispatchFormControlChangeEvent();
 }
 
 void HTMLFormControlElement::copyNonAttributePropertiesFromElement(const Element& source)
 {
     HTMLElement::copyNonAttributePropertiesFromElement(source);
     setNeedsValidityCheck();
 }
 
 } // namespace blink