sync: Fix crash on backend initialize failure

chrome/browser/sync/glue/sync_backend_host_core.h

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CHROME_BROWSER_SYNC_GLUE_SYNC_BACKEND_HOST_CORE_H_
 #define CHROME_BROWSER_SYNC_GLUE_SYNC_BACKEND_HOST_CORE_H_
 
 #include "base/memory/ref_counted.h"
 
 #include "base/timer/timer.h"
@@ skipping 301 matching lines @@
   syncer::CancelationSignal release_request_context_signal_;
   syncer::CancelationSignal stop_syncing_signal_;
 
   // Matches the value of SyncPref's HasSyncSetupCompleted() flag at init time.
   // Should not be used for anything except for UMAs and logging.
   const bool has_sync_setup_completed_;
 
   // 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);
 };
 
 }  // namespace browser_sync
 
 #endif  // CHROME_BROWSER_SYNC_GLUE_SYNC_BACKEND_HOST_CORE_H_