[oilpan] The Node hierarchy should have correct accept method chains

Source/core/html/FileInputType.cpp

Index: Source/core/html/FileInputType.cpp
diff --git a/Source/core/html/FileInputType.cpp b/Source/core/html/FileInputType.cpp
index fbf3d77bda90b3b1548b1710967edcde795586af..762d98b38d603959e6114efe3d0b5b149ca6c0be 100644
--- a/Source/core/html/FileInputType.cpp
+++ b/Source/core/html/FileInputType.cpp
@@ -54,6 +54,8 @@ public:
     static PassRefPtr<UploadButtonElement> create(Handle<Document>);
     static PassRefPtr<UploadButtonElement> createForMultiple(Handle<Document>);
 
+    virtual void acceptHeapVisitor(Visitor*) const OVERRIDE;
+
 private:
     UploadButtonElement(Handle<Document>);
 
@@ -87,6 +89,11 @@ const AtomicString& UploadButtonElement::shadowPseudoId() const
     return pseudoId;
 }
 
+void UploadButtonElement::acceptHeapVisitor(Visitor* visitor) const
+{
+    HTMLInputElement::acceptHeapVisitor(visitor);
+}
+
 inline FileInputType::FileInputType(Handle<HTMLInputElement> element)
     : BaseClickableWithKeyInputType(element)
     , m_fileList(FileList::create())