Add OVERRIDE to chrome/browser/.

chrome/browser/printing/print_job_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_PRINTING_PRINT_JOB_MANAGER_H_
 #define CHROME_BROWSER_PRINTING_PRINT_JOB_MANAGER_H_
 #pragma once
 
 #include <vector>
 
@@ skipping 34 matching lines @@
 
   // Pops a queued PrintJobWorkerOwner object that was previously queued. Can be
   // called from any thread. Current use case is poping from the browser thread.
   void PopPrinterQuery(int document_cookie, scoped_refptr<PrinterQuery>* job);
 
   static void RegisterPrefs(PrefService* prefs);
 
   // content::NotificationObserver
   virtual void Observe(int type,
                        const content::NotificationSource& source,
-                       const content::NotificationDetails& details);
+                       const content::NotificationDetails& details) OVERRIDE;
 
   bool printing_enabled() {
     return *printing_enabled_;
   }
 
  private:
   typedef std::vector<scoped_refptr<PrintJob> > PrintJobs;
   typedef std::vector<scoped_refptr<PrinterQuery> > PrinterQueries;
 
   // Processes a NOTIFY_PRINT_JOB_EVENT notification.
@@ skipping 19 matching lines @@
 
   // Current print jobs that are active.
   PrintJobs current_jobs_;
 
   DISALLOW_COPY_AND_ASSIGN(PrintJobManager);
 };
 
 }  // namespace printing
 
 #endif  // CHROME_BROWSER_PRINTING_PRINT_JOB_MANAGER_H_