Account for null Document Frame when parsing inert attribute

third_party/WebKit/Source/core/html/HTMLElement.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  * Copyright (C) 2004-2008, 2013, 2014 Apple Inc. All rights reserved.
  * Copyright (C) 2009 Torch Mobile Inc. All rights reserved.
  * (http://www.torchmobile.com/)
  * Copyright (C) 2011 Motorola Mobility. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
@@ skipping 449 matching lines @@
   if (params.name == tabindexAttr || params.name == XMLNames::langAttr)
     return Element::ParseAttribute(params);
 
   if (params.name == dirAttr) {
     DirAttributeChanged(params.new_value);
   } else if (params.name == langAttr) {
     PseudoStateChanged(CSSSelector::kPseudoLang);
   } else if (params.name == inertAttr) {
     UseCounter::Count(GetDocument(), WebFeature::kInertAttribute);
     UpdateDistribution();
-    GetDocument().GetFrame()->SetIsInert(GetDocument().LocalOwner() &&
-                                         GetDocument().LocalOwner()->IsInert());
+    if (GetDocument().GetFrame()) {
+      GetDocument().GetFrame()->SetIsInert(
+          GetDocument().LocalOwner() && GetDocument().LocalOwner()->IsInert());
+    }
   } else if (params.name == nonceAttr) {
     if (params.new_value != g_empty_atom)
       setNonce(params.new_value);
   } else {
     const AtomicString& event_name = EventNameForAttributeName(params.name);
     if (!event_name.IsNull()) {
       SetAttributeEventListener(
           event_name,
           CreateAttributeEventListener(this, params.name, params.new_value,
                                        EventParameterName()));
@@ skipping 702 matching lines @@
 
 #ifndef NDEBUG
 
 // For use in the debugger
 void dumpInnerHTML(blink::HTMLElement*);
 
 void dumpInnerHTML(blink::HTMLElement* element) {
   printf("%s\n", element->innerHTML().Ascii().data());
 }
 #endif