sync: Fix crash on backend initialize failure

chrome/browser/sync/glue/sync_backend_host_core.h

Index: chrome/browser/sync/glue/sync_backend_host_core.h
diff --git a/chrome/browser/sync/glue/sync_backend_host_core.h b/chrome/browser/sync/glue/sync_backend_host_core.h
index 4ae89c78929fa8c265682bee11f1b2c99008dd0d..635a3312c17965589dc4abb38a977f7bf668a351 100644
--- a/chrome/browser/sync/glue/sync_backend_host_core.h
+++ b/chrome/browser/sync/glue/sync_backend_host_core.h
@@ -319,6 +319,9 @@ class SyncBackendHostCore
   // Set when we've been asked to forward sync protocol events to the frontend.
   bool forward_protocol_events_;
 
+  // Set when the forwarding of per-type debug counters is enabled.
+  bool forward_type_info_;
+
   base::WeakPtrFactory<SyncBackendHostCore> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(SyncBackendHostCore);