[Sync] Remove SyncEngine::UnregisterInvalidationIds

components/sync/engine/sync_engine.h

 // Copyright 2012 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_ENGINE_SYNC_ENGINE_H_
 #define COMPONENTS_SYNC_ENGINE_SYNC_ENGINE_H_
 
 #include <map>
 #include <memory>
 #include <string>
@@ skipping 113 matching lines @@
 
   // Kick off shutdown procedure. Attempts to cut short any long-lived or
   // blocking sync thread tasks so that the shutdown on sync thread task that
   // we're about to post won't have to wait very long.
   virtual void StopSyncingForShutdown() = 0;
 
   // See the implementation and Core::DoShutdown for details.
   // Must be called *after* StopSyncingForShutdown.
   virtual void Shutdown(ShutdownReason reason) = 0;
 
-  // Removes all current registrations from the backend on the
-  // InvalidationService.
-  virtual void UnregisterInvalidationIds() = 0;
-
   // Changes the set of data types that are currently being synced.
   // The ready_task will be run when configuration is done with the
   // set of all types that failed configuration (i.e., if its argument
   // is non-empty, then an error was encountered).
   // Returns the set of types that are ready to start without needing any
   // further sync activity.
   // ModelTypeConfigurer implementation.
   ModelTypeSet ConfigureDataTypes(
       ConfigureReason reason,
       const DataTypeConfigStateMap& config_state_map,
@@ skipping 67 matching lines @@
   // See SyncManager::OnCookieJarChanged.
   virtual void OnCookieJarChanged(bool account_mismatch, bool empty_jar) = 0;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(SyncEngine);
 };
 
 }  // namespace syncer
 
 #endif  // COMPONENTS_SYNC_ENGINE_SYNC_ENGINE_H_