[Sync] Sanity test for UserEvents.

components/sync/test/fake_server/unique_client_entity.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_SYNC_TEST_FAKE_SERVER_UNIQUE_CLIENT_ENTITY_H_
 #define COMPONENTS_SYNC_TEST_FAKE_SERVER_UNIQUE_CLIENT_ENTITY_H_
 
 #include <stdint.h>
 
 #include <memory>
@@ skipping 30 matching lines @@
   // Factory function for creating a UniqueClientEntity.
   static std::unique_ptr<FakeServerEntity> Create(
       const sync_pb::SyncEntity& client_entity);
 
   // Factory function for creating a UniqueClientEntity for use in the
   // FakeServer injection API.
   static std::unique_ptr<FakeServerEntity> CreateForInjection(
       const std::string& name,
       const sync_pb::EntitySpecifics& entity_specifics);
 
-  // Derives an ID from a unique client tagged entity.
-  static std::string EffectiveIdForClientTaggedEntity(
-      const sync_pb::SyncEntity& entity);
-
   // FakeServerEntity implementation.
   bool RequiresParentId() const override;
   std::string GetParentId() const override;
   void SerializeAsProto(sync_pb::SyncEntity* proto) const override;
 
  private:
   // These member values have equivalent fields in SyncEntity.
   int64_t creation_time_;
   int64_t last_modified_time_;
 };
 
 }  // namespace fake_server
 
 #endif  // COMPONENTS_SYNC_TEST_FAKE_SERVER_UNIQUE_CLIENT_ENTITY_H_