Stop returning an empty handle from createWrapper()

third_party/WebKit/Source/core/dom/Document.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  *           (C) 2006 Alexey Proskuryakov (ap@webkit.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2011, 2012 Apple Inc. All rights reserved.
  * Copyright (C) 2008, 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  * Copyright (C) 2008, 2009, 2011, 2012 Google Inc. All rights reserved.
  * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies)
  * Copyright (C) Research In Motion Limited 2010-2011. All rights reserved.
@@ skipping 5832 matching lines @@
     const WrapperTypeInfo* wrapperType = wrapperTypeInfo();
 
     if (frame() && frame()->script().initializeMainWorld()) {
         // initializeMainWorld may have created a wrapper for the object, retry from the start.
         v8::Local<v8::Object> wrapper = DOMDataStore::getWrapper(this, isolate);
         if (!wrapper.IsEmpty())
             return wrapper;
     }
 
     v8::Local<v8::Object> wrapper = V8DOMWrapper::createWrapper(isolate, creationContext, wrapperType);
-    if (UNLIKELY(wrapper.IsEmpty()))
-        return wrapper;
-
+    DCHECK(!wrapper.IsEmpty());
     wrapperType->installConditionallyEnabledProperties(wrapper, isolate);
     return associateWithWrapper(isolate, wrapperType, wrapper);
 }
 
 v8::Local<v8::Object> Document::associateWithWrapper(v8::Isolate* isolate, const WrapperTypeInfo* wrapperType, v8::Local<v8::Object> wrapper)
 {
     wrapper = V8DOMWrapper::associateObjectWithWrapper(isolate, this, wrapperType, wrapper);
     DOMWrapperWorld& world = DOMWrapperWorld::current(isolate);
     if (world.isMainWorld() && frame())
         frame()->script().windowProxy(world)->updateDocumentWrapper(wrapper);
@@ skipping 168 matching lines @@
 }
 
 void showLiveDocumentInstances()
 {
     WeakDocumentSet& set = liveDocumentSet();
     fprintf(stderr, "There are %u documents currently alive:\n", set.size());
     for (Document* document : set)
         fprintf(stderr, "- Document %p URL: %s\n", document, document->url().getString().utf8().data());
 }
 #endif