Revert of Bring up of the enhanced bookmarks cluster service.

components/enhanced_bookmarks/pref_names.h

Index: components/enhanced_bookmarks/pref_names.h
diff --git a/components/enhanced_bookmarks/pref_names.h b/components/enhanced_bookmarks/pref_names.h
deleted file mode 100644
index a063d7e908da614682b1926979012279626e31db..0000000000000000000000000000000000000000
--- a/components/enhanced_bookmarks/pref_names.h
+++ /dev/null
@@ -1,19 +0,0 @@
-// 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_PREF_NAMES_H_
-#define COMPONENTS_ENHANCED_BOOKMARKS_PREF_NAMES_H_
-
-#include "build/build_config.h"
-
-namespace enhanced_bookmarks {
-namespace prefs {
-
-// Stores the last retrieved bookmark clusters from the server.
-extern const char kBookmarkClusters[];
-
-}  // namespace prefs
-}  // namespace enhanced_bookmarks
-
-#endif  // COMPONENTS_ENHANCED_BOOKMARKS_PREF_NAMES_H_