Fix memory leak in Sync FakeServerEntity

sync/test/fake_server/fake_server_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 SYNC_TEST_FAKE_SERVER_FAKE_SERVER_ENTITY_H_
 #define SYNC_TEST_FAKE_SERVER_FAKE_SERVER_ENTITY_H_
 
 #include <map>
 #include <string>
 
@@ skipping 20 matching lines @@
 
   virtual ~FakeServerEntity();
   const std::string& GetId() const;
   syncer::ModelType GetModelType() const;
   int64 GetVersion() const;
   void SetVersion(int64 version);
   const std::string& GetName() const;
 
   // Common data items needed by server
   virtual std::string GetParentId() const = 0;
-  virtual sync_pb::SyncEntity* SerializeAsProto() = 0;
+  virtual void SerializeAsProto(sync_pb::SyncEntity* proto) = 0;
   virtual bool IsDeleted() const = 0;
   virtual bool IsFolder() const = 0;
 
  protected:
   // Extracts the ModelType from |id|. If |id| is malformed or does not contain
   // a valid ModelType, UNSPECIFIED is returned.
   static syncer::ModelType GetModelTypeFromId(const std::string& id);
 
   FakeServerEntity(const std::string& id,
                    const syncer::ModelType& model_type,
@@ skipping 12 matching lines @@
   // The version of this entity.
   int64 version_;
 
   // The name of the entity.
   std::string name_;
 };
 
 }  // namespace fake_server
 
 #endif  // SYNC_TEST_FAKE_SERVER_FAKE_SERVER_ENTITY_H_