Split up SyncEngineEventListener callbacks

sync/internal_api/public/sessions/model_neutral_state.h

Index: sync/internal_api/public/sessions/model_neutral_state.h
diff --git a/sync/internal_api/public/sessions/model_neutral_state.h b/sync/internal_api/public/sessions/model_neutral_state.h
index 4979d3ad10117b02d926cd467394382a0c16cbeb..beafcb94d6eb43e0e66430e9a31ae8a6d418514a 100644
--- a/sync/internal_api/public/sessions/model_neutral_state.h
+++ b/sync/internal_api/public/sessions/model_neutral_state.h
@@ -7,9 +7,9 @@
 
 #include "base/basictypes.h"
 #include "sync/base/sync_export.h"
+#include "sync/internal_api/public/base/model_type.h"
 #include "sync/internal_api/public/util/syncer_error.h"
 #include "sync/protocol/sync.pb.h"
-#include "sync/protocol/sync_protocol_error.h"
 
 namespace syncer {
 namespace sessions {
@@ -49,9 +49,6 @@ struct SYNC_EXPORT ModelNeutralState {
   int num_local_overwrites;
   int num_server_overwrites;
 
-  // Any protocol errors that we received during this sync session.
-  SyncProtocolError sync_protocol_error;
-
   // Records the most recent results of GetKey, PostCommit and GetUpdates
   // commands.
   SyncerError last_get_key_result;