Refactor ModelTypePayloadMap and ObjectIdPayloadMap to StateMaps.

chrome/browser/sync/glue/session_model_associator.cc

Index: chrome/browser/sync/glue/session_model_associator.cc
diff --git a/chrome/browser/sync/glue/session_model_associator.cc b/chrome/browser/sync/glue/session_model_associator.cc
index 67a017daa6ae2243dfe473bf70e2fe5c4eeecbe7..2e0a6057e702a05476a351cc0c4b9aabe370bfe0 100644
--- a/chrome/browser/sync/glue/session_model_associator.cc
+++ b/chrome/browser/sync/glue/session_model_associator.cc
@@ -30,7 +30,7 @@
 #include "content/public/browser/notification_service.h"
 #include "sync/api/sync_error.h"
 #include "sync/internal_api/public/base/model_type.h"
-#include "sync/internal_api/public/base/model_type_payload_map.h"
+#include "sync/internal_api/public/base/model_type_state_map.h"
 #include "sync/internal_api/public/read_node.h"
 #include "sync/internal_api/public/read_transaction.h"
 #include "sync/internal_api/public/write_node.h"
@@ -1410,12 +1410,12 @@ void SessionModelAssociator::TabNodePool::FreeTabNode(int64 sync_id) {
 void SessionModelAssociator::AttemptSessionsDataRefresh() const {
   DVLOG(1) << "Triggering sync refresh for sessions datatype.";
   const syncer::ModelType type = syncer::SESSIONS;
-  syncer::ModelTypePayloadMap payload_map;
-  payload_map[type] = "";
+  syncer::ModelTypeStateMap state_map;
+  state_map.insert(std::make_pair(type, syncer::InvalidationState()));
   content::NotificationService::current()->Notify(
       chrome::NOTIFICATION_SYNC_REFRESH_LOCAL,
       content::Source<Profile>(profile_),
-      content::Details<const syncer::ModelTypePayloadMap>(&payload_map));
+      content::Details<const syncer::ModelTypeStateMap>(&state_map));
 }
 
 bool SessionModelAssociator::GetLocalSession(