[Sync] Add support for enabling session sync remotely.

chrome/browser/sync/glue/data_type_manager.h

 // Copyright (c) 2011 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_GLUE_DATA_TYPE_MANAGER_H__
 #define CHROME_BROWSER_SYNC_GLUE_DATA_TYPE_MANAGER_H__
 #pragma once
 
 #include <set>
 #include <string>
@@ skipping 75 matching lines @@
 
   virtual void ConfigureWithoutNigori(const TypeSet& desired_types,
       sync_api::ConfigureReason reason) = 0;
 
   // Synchronously stops all registered data types.  If called after
   // Configure() is called but before it finishes, it will abort the
   // configure and any data types that have been started will be
   // stopped.
   virtual void Stop() = 0;
 
-  // Reference to map of data type controllers.
-  virtual const DataTypeController::TypeMap& controllers() = 0;
-
   // The current state of the data type manager.
   virtual State state() = 0;
 };
 
 }  // namespace browser_sync
 
 #endif  // CHROME_BROWSER_SYNC_GLUE_DATA_TYPE_MANAGER_H__