Have LiveNodeListBase::ownerNode() return a reference

Source/bindings/v8/custom/V8HTMLAllCollectionCustom.cpp

 /*
  * Copyright (C) 2009 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 69 matching lines @@
     HTMLAllCollection* imp = V8HTMLAllCollection::toNative(info.Holder());
     v8SetReturnValue(info, getItem(imp, info[0], info));
 }
 
 void V8HTMLAllCollection::legacyCallCustom(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     if (info.Length() < 1)
         return;
 
     HTMLAllCollection* imp = V8HTMLAllCollection::toNative(info.Holder());
-    Node* ownerNode = imp->ownerNode();
-    ASSERT(ownerNode);
+    Node& ownerNode = imp->ownerNode();
 
-    UseCounter::count(ownerNode->document(), UseCounter::DocumentAllLegacyCall);
+    UseCounter::count(ownerNode.document(), UseCounter::DocumentAllLegacyCall);
 
     if (info.Length() == 1) {
         v8SetReturnValue(info, getItem(imp, info[0], info));
         return;
     }
 
     // If there is a second argument it is the index of the item we want.
     V8TRYCATCH_FOR_V8STRINGRESOURCE_VOID(V8StringResource<>, name, info[0]);
     v8::Local<v8::Uint32> index = info[1]->ToArrayIndex();
     if (index.IsEmpty())
         return;
 
     if (Node* node = imp->namedItemWithIndex(name, index->Uint32Value())) {
         v8SetReturnValueFast(info, node, imp);
         return;
     }
 }
 
 } // namespace WebCore