Cleanup: IWYU for base/gtest_prod_util.h.

components/enhanced_bookmarks/enhanced_bookmark_model.h

 // Copyright 2014 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.
 
 #ifndef COMPONENTS_ENHANCED_BOOKMARKS_ENHANCED_BOOKMARK_MODEL_H_
 #define COMPONENTS_ENHANCED_BOOKMARKS_ENHANCED_BOOKMARK_MODEL_H_
 
 #include <map>
 #include <string>
 
 #include "base/cancelable_callback.h"
+#include "base/gtest_prod_util.h"
 #include "base/memory/linked_ptr.h"
 #include "base/memory/weak_ptr.h"
 #include "base/observer_list.h"
 #include "base/strings/string16.h"
 #include "components/bookmarks/browser/base_bookmark_model_observer.h"
 #include "components/bookmarks/browser/bookmark_node.h"
 #include "components/keyed_service/core/keyed_service.h"
 
 class GURL;
 
@@ skipping 190 matching lines @@
 
   std::string version_;
   std::string version_suffix_;
 
   base::WeakPtrFactory<EnhancedBookmarkModel> weak_ptr_factory_;
 };
 
 }  // namespace enhanced_bookmarks
 
 #endif  // COMPONENTS_ENHANCED_BOOKMARKS_ENHANCED_BOOKMARK_MODEL_H_