Add a tuple of name, local name for hashing custom element definitions.

third_party/WebKit/Source/bindings/core/v8/custom/V8HTMLElementCustom.cpp

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "bindings/core/v8/V8HTMLElement.h"
 
 #include "bindings/core/v8/DOMWrapperWorld.h"
 #include "bindings/core/v8/ExceptionState.h"
 #include "bindings/core/v8/V8Binding.h"
 #include "bindings/core/v8/V8BindingMacros.h"
@@ skipping 34 matching lines @@
     // TODO(dominicc): Implement cases where the definition's
     // construction stack is not empty when parser-creation is
     // implemented.
 
     ExceptionState exceptionState(
         ExceptionState::ConstructionContext,
         "HTMLElement",
         info.Holder(),
         isolate);
     Element* element = window->document()->createElement(
-        def->localName(),
+        def->descriptor().localName(),
         AtomicString(),
         exceptionState);
     if (exceptionState.throwIfNeeded())
         return;
     const WrapperTypeInfo* wrapperType = element->wrapperTypeInfo();
     v8::Local<v8::Object> wrapper = V8DOMWrapper::associateObjectWithWrapper(
         isolate,
         element,
         wrapperType,
         info.This());
 
     if (!v8CallBoolean(wrapper->SetPrototype(
         scriptState->context(),
         def->prototype(scriptState)))) {
         return;
     }
 }
 
 } // namespace blink