Add the "virtual" keyword on method overrides that are missing it.

chrome/browser/sync/glue/password_model_worker.h

 // Copyright (c) 2010 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_PASSWORD_MODEL_WORKER_H_
 #define CHROME_BROWSER_SYNC_GLUE_PASSWORD_MODEL_WORKER_H_
 #pragma once
 
 #include "chrome/browser/sync/engine/model_safe_worker.h"
 
@@ skipping 11 matching lines @@
 
 // A ModelSafeWorker for password models that accepts requests
 // from the syncapi that need to be fulfilled on the password thread,
 // which is the DB thread on Linux and Windows.
 class PasswordModelWorker : public browser_sync::ModelSafeWorker {
  public:
   explicit PasswordModelWorker(PasswordStore* password_store);
   virtual ~PasswordModelWorker();
 
   // ModelSafeWorker implementation. Called on syncapi SyncerThread.
-  void DoWorkAndWaitUntilDone(Callback0::Type* work);
+  virtual void DoWorkAndWaitUntilDone(Callback0::Type* work);
   virtual ModelSafeGroup GetModelSafeGroup() { return GROUP_PASSWORD; }
   virtual bool CurrentThreadIsWorkThread();
 
  private:
   void CallDoWorkAndSignalTask(Callback0::Type* work,
                                base::WaitableEvent* done);
 
   scoped_refptr<PasswordStore> password_store_;
   DISALLOW_COPY_AND_ASSIGN(PasswordModelWorker);
 };
 
 }  // namespace browser_sync
 
 #endif  // CHROME_BROWSER_SYNC_GLUE_PASSWORD_MODEL_WORKER_H_