Remove some dead code about "acknowledged types"

chrome/browser/sync/profile_sync_service.h

 // Copyright (c) 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 CHROME_BROWSER_SYNC_PROFILE_SYNC_SERVICE_H_
 #define CHROME_BROWSER_SYNC_PROFILE_SYNC_SERVICE_H_
 
 #include <set>
 #include <string>
 #include <utility>
@@ skipping 684 matching lines @@
   // Used by tests.
   bool auto_start_enabled() const;
   bool setup_in_progress() const;
 
   // Stops the sync backend and sets the flag for suppressing sync startup.
   void StopAndSuppress();
 
   // Resets the flag for suppressing sync startup and starts the sync backend.
   virtual void UnsuppressAndStart();
 
-  // Marks all currently registered types as "acknowledged" so we won't prompt
-  // the user about them any more.
-  void AcknowledgeSyncedTypes();
-
   SyncErrorController* sync_error_controller() {
     return sync_error_controller_.get();
   }
 
   // TODO(sync): This is only used in tests.  Can we remove it?
   const sync_driver::DataTypeStatusTable& data_type_status_table() const;
 
   sync_driver::DataTypeManager::ConfigureStatus configure_status() {
     return configure_status_;
   }
@@ skipping 455 matching lines @@
   base::WeakPtrFactory<ProfileSyncService> startup_controller_weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(ProfileSyncService);
 };
 
 bool ShouldShowActionOnUI(
     const syncer::SyncProtocolError& error);
 
 
 #endif  // CHROME_BROWSER_SYNC_PROFILE_SYNC_SERVICE_H_