[Sync] Move keystore key handling to SyncEncryptionHandlerImpl

sync/internal_api/public/sync_manager.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 SYNC_INTERNAL_API_PUBLIC_SYNC_MANAGER_H_
 #define SYNC_INTERNAL_API_PUBLIC_SYNC_MANAGER_H_
 
 #include <string>
 #include <vector>
 
@@ skipping 369 matching lines @@
   virtual void AddObserver(Observer* observer) = 0;
 
   // Remove the given observer.  Make sure to call this if the
   // Observer is being destroyed so the SyncManager doesn't
   // potentially dereference garbage.
   virtual void RemoveObserver(Observer* observer) = 0;
 
   // Status-related getter.  May be called on any thread.
   virtual SyncStatus GetDetailedStatus() const = 0;
 
-  // Extracts the keystore encryption bootstrap token if a keystore key existed.
-  // Returns true if bootstrap token successfully extracted, false otherwise.
-  virtual bool GetKeystoreKeyBootstrapToken(std::string* token) = 0;
-
   // Call periodically from a database-safe thread to persist recent changes
   // to the syncapi model.
   virtual void SaveChanges() = 0;
 
   // Initiates shutdown of various components in the sync engine.  Must be
   // called from the main thread to allow preempting ongoing tasks on the sync
   // loop (that may be blocked on I/O).  The semantics of |callback| are the
   // same as with StartConfigurationMode. If provided and a scheduler / sync
   // loop exists, it will be invoked from the sync loop by the scheduler to
   // notify that all work has been flushed + cancelled, and it is idle.
@@ skipping 17 matching lines @@
   // any remaining unsynced items.  May be called on any thread.
   virtual bool HasUnsyncedItems() = 0;
 
   // Returns the SyncManager's encryption handler.
   virtual SyncEncryptionHandler* GetEncryptionHandler() = 0;
 };
 
 }  // namespace syncer
 
 #endif  // SYNC_INTERNAL_API_PUBLIC_SYNC_MANAGER_H_