Revert 244381 "Support GU retry command in sync engine. The comm..."

trunk/src/sync/protocol/sync_enums.proto

Index: trunk/src/sync/protocol/sync_enums.proto
===================================================================
--- trunk/src/sync/protocol/sync_enums.proto	(revision 244437)
+++ trunk/src/sync/protocol/sync_enums.proto	(working copy)
@@ -141,10 +141,8 @@
                            // confused with FIRST_UPDATE.
     RECONFIGURATION = 10;  // The client is in configuration mode because the
                            // user opted to sync a different set of datatypes.
-    GU_TRIGGER = 12;  // The client is in 'normal' mode.  It may have several
-                      // reasons for requesting an update.  See the per-type
-                      // GetUpdateTriggers message for more details.
-    RETRY = 13;  // A retry GU to pick up updates missed by last GU due to
-                 // replication delay, missing hints, etc.
+    GU_TRIGGER = 12; // The client is in 'normal' mode.  It may have several
+                     // reasons for requesting an update.  See the per-type
+                     // GetUpdateTriggers message for more details.
   }
 }