[Sync] Add support for proxy types

sync/internal_api/sync_manager_impl.cc

Index: sync/internal_api/sync_manager_impl.cc
diff --git a/sync/internal_api/sync_manager_impl.cc b/sync/internal_api/sync_manager_impl.cc
index 874444ba1b552a8ddff4779b8f9cb8734e4c1799..e9a7f1a45810911acf5c23454584d778e922caa0 100644
--- a/sync/internal_api/sync_manager_impl.cc
+++ b/sync/internal_api/sync_manager_impl.cc
@@ -571,6 +571,7 @@ bool SyncManagerImpl::PurgePartiallySyncedTypes() {
   partially_synced_types.RemoveAll(InitialSyncEndedTypes());
   partially_synced_types.RemoveAll(GetTypesWithEmptyProgressMarkerToken(
       ModelTypeSet::All()));
+  partially_synced_types.RemoveAll(LocalTypes());
 
   DVLOG(1) << "Purging partially synced types "
            << ModelTypeSetToString(partially_synced_types);
@@ -586,6 +587,7 @@ bool SyncManagerImpl::PurgeDisabledTypes(
     ModelTypeSet currently_enabled_types) {
   ModelTypeSet disabled_types = Difference(previously_enabled_types,
                                            currently_enabled_types);
+  disabled_types.RemoveAll(LocalTypes());
   if (disabled_types.Empty())
     return true;