Remove unused ShadowRootUsageOriginType enum

Source/core/dom/shadow/ShadowRoot.cpp

 /*
  * Copyright (C) 2011 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.
  *     * Neither the name of Google Inc. nor the names of its
@@ skipping 32 matching lines @@
 
 namespace WebCore {
 
 struct SameSizeAsShadowRoot : public DocumentFragment, public TreeScope, public DoublyLinkedListNode<ShadowRoot> {
     void* pointers[3];
     unsigned countersAndFlags[1];
 };
 
 COMPILE_ASSERT(sizeof(ShadowRoot) == sizeof(SameSizeAsShadowRoot), shadowroot_should_stay_small);
 
-enum ShadowRootUsageOriginType {
-    ShadowRootUsageOriginWeb = 0,
-    ShadowRootUsageOriginNotWeb,
-    ShadowRootUsageOriginMax
-};
-
 ShadowRoot::ShadowRoot(Document& document, ShadowRootType type)
     : DocumentFragment(0, CreateShadowRoot)
     , TreeScope(*this, document)
     , m_prev(0)
     , m_next(0)
     , m_numberOfStyles(0)
     , m_applyAuthorStyles(false)
     , m_resetStyleInheritance(false)
     , m_type(type)
     , m_registeredWithParentShadowRoot(false)
@@ skipping 401 matching lines @@
 {
     ensureShadowRootRareData()->setChildrenAffectedByFirstChildRules(true);
 }
 
 void ShadowRoot::setChildrenAffectedByLastChildRules()
 {
     ensureShadowRootRareData()->setChildrenAffectedByLastChildRules(true);
 }
 
 }