[Sync] Nest UserEvent message classes within UserEventSpecifics.

components/sync/protocol/proto_enum_conversions.h

 // Copyright 2012 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_PROTOCOL_PROTO_ENUM_CONVERSIONS_H_
 #define COMPONENTS_SYNC_PROTOCOL_PROTO_ENUM_CONVERSIONS_H_
 
 #include "components/sync/protocol/app_list_specifics.pb.h"
 #include "components/sync/protocol/app_specifics.pb.h"
 #include "components/sync/protocol/client_debug_info.pb.h"
@@ skipping 47 matching lines @@
 
 const char* ProtoEnumToString(
     sync_pb::SyncEnums::PageTransitionRedirectType redirect_type);
 
 const char* ProtoEnumToString(sync_pb::SyncEnums::SingletonDebugEventType type);
 
 const char* ProtoEnumToString(sync_pb::TabNavigation::BlockedState state);
 
 const char* ProtoEnumToString(sync_pb::TabNavigation::PasswordState state);
 
-const char* ProtoEnumToString(sync_pb::Translation::Interaction interaction);
+const char* ProtoEnumToString(
+    sync_pb::UserEventSpecifics::Translation::Interaction interaction);
 
 const char* ProtoEnumToString(
     sync_pb::WalletMaskedCreditCard::WalletCardClass wallet_card_class);
 
 const char* ProtoEnumToString(
     sync_pb::WalletMaskedCreditCard::WalletCardStatus wallet_card_status);
 
 const char* ProtoEnumToString(
     sync_pb::WalletMaskedCreditCard::WalletCardType wallet_card_type);
 
 const char* ProtoEnumToString(
     sync_pb::WalletMetadataSpecifics::Type wallet_metadata_type);
 
 const char* ProtoEnumToString(
     sync_pb::WifiCredentialSpecifics::SecurityClass security_class);
 
 }  // namespace syncer
 
 #endif  // COMPONENTS_SYNC_PROTOCOL_PROTO_ENUM_CONVERSIONS_H_