Fix official Mac build for strict virtual annotations check.

chrome/browser/rlz/rlz.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_RLZ_RLZ_H_
 #define CHROME_BROWSER_RLZ_RLZ_H_
 
 #include "build/build_config.h"
 
 #if defined(ENABLE_RLZ)
@@ skipping 85 matching lines @@
 
 #if !defined(OS_IOS)
   // Records that the app list search has been used.
   static void RecordAppListSearch();
 #endif
 
   // The following methods are made protected so that they can be used for
   // testing purposes. Production code should never need to call these.
  protected:
   RLZTracker();
-  virtual ~RLZTracker();
+  ~RLZTracker() override;
 
   // Called by InitRlzFromProfileDelayed with values taken from |profile|.
   static bool InitRlzDelayed(bool first_run,
                              bool send_ping_immediately,
                              base::TimeDelta delay,
                              bool is_google_default_search,
                              bool is_google_homepage,
                              bool is_google_in_startpages);
 
   // Performs initialization of RLZ tracker that is purposefully delayed so
   // that it does not interfere with chrome startup time.
   virtual void DelayedInit();
 
   // content::NotificationObserver implementation:
-  virtual void Observe(int type,
+  void Observe(int type,
                        const content::NotificationSource& source,
                        const content::NotificationDetails& details) override;
 
   // Used by test code to override the default RLZTracker instance returned
   // by GetInstance().
   void set_tracker(RLZTracker* tracker) {
     tracker_ = tracker;
   }
 
   // Sends the financial ping to the RLZ servers and invalidates the RLZ string
@@ skipping 105 matching lines @@
 
   // Minimum delay before sending financial ping after initialization.
   base::TimeDelta min_init_delay_;
 
   DISALLOW_COPY_AND_ASSIGN(RLZTracker);
 };
 
 #endif  // defined(ENABLE_RLZ)
 
 #endif  // CHROME_BROWSER_RLZ_RLZ_H_