node.cloneNode() should clone the value of file upload elements

Source/core/html/HTMLInputElement.cpp

Index: Source/core/html/HTMLInputElement.cpp
diff --git a/Source/core/html/HTMLInputElement.cpp b/Source/core/html/HTMLInputElement.cpp
index 7952c58f83be743b8803e9610ed433ab59f45558..736d6166a972d3ff580c39b9786a19b79de3ff00 100644
--- a/Source/core/html/HTMLInputElement.cpp
+++ b/Source/core/html/HTMLInputElement.cpp
@@ -909,6 +909,7 @@ void HTMLInputElement::copyNonAttributePropertiesFromElement(const Element& sour
     setChecked(sourceElement.m_isChecked);
     m_reflectsCheckedAttribute = sourceElement.m_reflectsCheckedAttribute;
     m_isIndeterminate = sourceElement.m_isIndeterminate;
+    m_inputType->copyNonAttributeProperties(sourceElement);
 
     HTMLTextFormControlElement::copyNonAttributePropertiesFromElement(source);
 
@@ -1319,7 +1320,7 @@ KURL HTMLInputElement::src() const
     return document().completeURL(fastGetAttribute(srcAttr));
 }
 
-FileList* HTMLInputElement::files()
+FileList* HTMLInputElement::files() const
 {
     return m_inputType->files();
 }