Standardize usage of virtual/override/final in chrome/browser/sync/

chrome/browser/sync/glue/sync_backend_host.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_GLUE_SYNC_BACKEND_HOST_H_
 #define CHROME_BROWSER_SYNC_GLUE_SYNC_BACKEND_HOST_H_
 
 #include <string>
 
 #include "base/basictypes.h"
@@ skipping 34 matching lines @@
 // An API to "host" the top level SyncAPI element.
 //
 // This class handles dispatch of potentially blocking calls to appropriate
 // threads and ensures that the SyncFrontend is only accessed on the UI loop.
 class SyncBackendHost : public sync_driver::BackendDataTypeConfigurer {
  public:
   typedef syncer::SyncStatus Status;
 
   // Stubs used by implementing classes.
   SyncBackendHost();
-  virtual ~SyncBackendHost();
+  ~SyncBackendHost() override;
 
   // Called on the frontend's thread to kick off asynchronous initialization.
   // Optionally deletes the "Sync Data" folder during init in order to make
   // sure we're starting fresh.
   //
   // |report_unrecoverable_error_function| can be NULL.  Note:
   // |unrecoverable_error_handler| may be invoked from any thread.
   virtual void Initialize(
       sync_driver::SyncFrontend* frontend,
       scoped_ptr<base::Thread> sync_thread,
@@ skipping 147 matching lines @@
   virtual void DisableDirectoryTypeDebugInfoForwarding() = 0;
 
   virtual base::MessageLoop* GetSyncLoopForTesting() = 0;
 
   DISALLOW_COPY_AND_ASSIGN(SyncBackendHost);
 };
 
 }  // namespace browser_sync
 
 #endif  // CHROME_BROWSER_SYNC_GLUE_SYNC_BACKEND_HOST_H_