sync: add garbage collection to SessionsSyncManager

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 <string>
 #include <utility>
 #include <vector>
@@ skipping 854 matching lines @@
   void RefreshSpareBootstrapToken(const std::string& passphrase);
 #endif
 
   // Internal unrecoverable error handler. Used to track error reason via
   // Sync.UnrecoverableErrors histogram.
   void OnInternalUnrecoverableError(const tracked_objects::Location& from_here,
                                     const std::string& message,
                                     bool delete_sync_database,
                                     UnrecoverableErrorReason reason);
 
+  bool IsSessionsDataTypeControllerRunning() const;
+
   // Returns the username (in form of an email address) that should be used in
   // the credentials.
   std::string GetEffectiveUsername();
 
   // Returns the account ID to use to get tokens.
   std::string GetAccountIdToUse();
 
  // Factory used to create various dependent objects.
   scoped_ptr<ProfileSyncComponentsFactory> factory_;
 
@@ skipping 156 matching lines @@
   scoped_ptr<SessionsSyncManager> sessions_sync_manager_;
 
   DISALLOW_COPY_AND_ASSIGN(ProfileSyncService);
 };
 
 bool ShouldShowActionOnUI(
     const syncer::SyncProtocolError& error);
 
 
 #endif  // CHROME_BROWSER_SYNC_PROFILE_SYNC_SERVICE_H_