[Sync] Deprecate old histograms

components/browser_sync/browser/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 COMPONENTS_BROWSER_SYNC_BROWSER_PROFILE_SYNC_SERVICE_H_
 #define COMPONENTS_BROWSER_SYNC_BROWSER_PROFILE_SYNC_SERVICE_H_
 
 #include <memory>
 #include <set>
 #include <string>
@@ skipping 661 matching lines @@
   FRIEND_TEST_ALL_PREFIXES(ProfileSyncServiceTest, InitialState);
 
   // Stops the sync engine. Does NOT set IsSyncRequested to false. Use
   // RequestStop for that. |data_fate| controls whether the local sync data is
   // deleted or kept when the engine shuts down.
   void StopImpl(SyncStopDataFate data_fate);
 
   // Update the last auth error and notify observers of error state.
   void UpdateAuthErrorState(const GoogleServiceAuthError& error);
 
-  // Detects and attempts to recover from a previous improper datatype
-  // configuration where Keep Everything Synced and the preferred types were
-  // not correctly set.
-  void TrySyncDatatypePrefRecovery();
-
   // Puts the backend's sync scheduler into NORMAL mode.
   // Called when configuration is complete.
   void StartSyncingWithServer();
 
   // Called when we've determined that we don't need a passphrase (either
   // because OnPassphraseAccepted() was called, or because we've gotten a
   // OnPassphraseRequired() but no data types are enabled).
   void ResolvePassphraseRequired();
 
   // During initial signin, ProfileSyncService caches the user's signin
@@ skipping 323 matching lines @@
   base::WeakPtrFactory<ProfileSyncService> startup_controller_weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(ProfileSyncService);
 };
 
 bool ShouldShowActionOnUI(
     const syncer::SyncProtocolError& error);
 
 
 #endif  // COMPONENTS_BROWSER_SYNC_BROWSER_PROFILE_SYNC_SERVICE_H_