Only 'form associated' elements have a potential form owner.

Source/core/html/HTMLObjectElement.h

Index: Source/core/html/HTMLObjectElement.h
diff --git a/Source/core/html/HTMLObjectElement.h b/Source/core/html/HTMLObjectElement.h
index 7aaa73e7ff0d4c2246cb7a92aeaa0219fbad3992..ea2a6a1022d7fdebef0467188f98564510753606 100644
--- a/Source/core/html/HTMLObjectElement.h
+++ b/Source/core/html/HTMLObjectElement.h
@@ -42,13 +42,11 @@ public:
     virtual bool useFallbackContent() const OVERRIDE;
     virtual void renderFallbackContent() OVERRIDE;
 
-    // Implementations of FormAssociatedElement
-    HTMLFormElement* form() const { return FormAssociatedElement::form(); }
-
     virtual bool isFormControlElement() const { return false; }
 
     virtual bool isEnumeratable() const { return true; }
     virtual bool isInteractiveContent() const OVERRIDE;
+    virtual bool isFormAssociatedElement() const OVERRIDE { return true; }
     virtual bool appendFormData(FormDataList&, bool);
 
     virtual bool isObjectElement() const OVERRIDE { return true; }