[Sync] Clean up ProfileSyncService observer events

components/sync_driver/sync_frontend.h

 // Copyright 2014 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 COMPONENTS_SYNC_DRIVER_SYNC_FRONTEND_H_
 #define COMPONENTS_SYNC_DRIVER_SYNC_FRONTEND_H_
 
 #include "base/basictypes.h"
 #include "sync/internal_api/public/base/model_type.h"
 #include "sync/internal_api/public/sync_encryption_handler.h"
@@ skipping 36 matching lines @@
   virtual void OnBackendInitialized(
       const syncer::WeakHandle<syncer::JsBackend>& js_backend,
       const syncer::WeakHandle<syncer::DataTypeDebugInfoListener>&
           debug_info_listener,
       const std::string& cache_guid,
       bool success) = 0;
 
   // The backend queried the server recently and received some updates.
   virtual void OnSyncCycleCompleted() = 0;
 
-  // Configure ran into some kind of error. But it is scheduled to be
-  // retried.
-  virtual void OnSyncConfigureRetry() = 0;
-
   // Informs the frontned of some network event.  These notifications are
   // disabled by default and must be enabled through an explicit request to the
   // SyncBackendHost.
   //
   // It's disabld by default to avoid copying data across threads when no one
   // is listening for it.
   virtual void OnProtocolEvent(const syncer::ProtocolEvent& event) = 0;
 
   // Called when we receive an updated commit counter for a directory type.
   //
@@ skipping 65 matching lines @@
   virtual void OnExperimentsChanged(
       const syncer::Experiments& experiments) = 0;
 
   // Called when the sync cycle returns there is an user actionable error.
   virtual void OnActionableError(const syncer::SyncProtocolError& error) = 0;
 };
 
 }  // namespace sync_driver
 
 #endif  // COMPONENTS_SYNC_DRIVER_SYNC_FRONTEND_H_