Revert "Revert 182527" ([Sync] Make SESSIONS an implicit type)

sync/protocol/proto_value_conversions.cc

Index: sync/protocol/proto_value_conversions.cc
diff --git a/sync/protocol/proto_value_conversions.cc b/sync/protocol/proto_value_conversions.cc
index 3964578d9edcc9d7c47881a292acbb19425f0f8d..bc5b0aedc2504ea76101efae6e78899fb50cf32d 100644
--- a/sync/protocol/proto_value_conversions.cc
+++ b/sync/protocol/proto_value_conversions.cc
@@ -620,6 +620,7 @@ base::DictionaryValue* GetUpdatesMessageToValue(
   SET_INT32(batch_size);
   SET_REP(from_progress_marker, DataTypeProgressMarkerToValue);
   SET_BOOL(streaming);
+  SET_BOOL(need_encryption_key);
   SET_BOOL(create_mobile_bookmarks_folder);
   return value;
 }
@@ -777,6 +778,7 @@ base::DictionaryValue* ClientConfigParamsToValue(
     const sync_pb::ClientConfigParams& proto) {
   base::DictionaryValue* value = new base::DictionaryValue();
   SET_INT32_REP(enabled_type_ids);
+  SET_BOOL(tabs_datatype_enabled);
   return value;
 }