Don't mutate the DOM from inside an Element's constructor

Source/core/html/HTMLKeygenElement.h

Index: Source/core/html/HTMLKeygenElement.h
diff --git a/Source/core/html/HTMLKeygenElement.h b/Source/core/html/HTMLKeygenElement.h
index a3352016e576f0bf3eff840bc68699a1940bf950..7c4f783caa1d18083367d1fa2391ec0172ae39f5 100644
--- a/Source/core/html/HTMLKeygenElement.h
+++ b/Source/core/html/HTMLKeygenElement.h
@@ -32,10 +32,7 @@ class HTMLSelectElement;
 
 class HTMLKeygenElement FINAL : public HTMLFormControlElementWithState {
 public:
-    static PassRefPtrWillBeRawPtr<HTMLKeygenElement> create(Document& document, HTMLFormElement* form)
-    {
-        return adoptRefWillBeRefCountedGarbageCollected(new HTMLKeygenElement(document, form));
-    }
+    static PassRefPtrWillBeRawPtr<HTMLKeygenElement> create(Document&, HTMLFormElement*);
 
     virtual bool willValidate() const OVERRIDE { return false; }