Chromium roll (https://codereview.chromium.org/976353002)

mojo/services/view_manager/public/cpp/view_tracker.h

 // Copyright 2014 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 MOJO_SERVICES_VIEW_MANAGER_PUBLIC_CPP_VIEW_TRACKER_H_
 #define MOJO_SERVICES_VIEW_MANAGER_PUBLIC_CPP_VIEW_TRACKER_H_
 
 #include <stdint.h>
 #include <set>
 
@@ skipping 16 matching lines @@
   void Add(View* view);
 
   // Removes |view| from the set of views being tracked.
   void Remove(View* view);
 
   // Returns true if |view| was previously added and has not been removed or
   // deleted.
   bool Contains(View* view);
 
   // ViewObserver overrides:
-  virtual void OnViewDestroying(View* view) override;
+  void OnViewDestroying(View* view) override;
 
  private:
   Views views_;
 
   MOJO_DISALLOW_COPY_AND_ASSIGN(ViewTracker);
 };
 
 }  // namespace mojo
 
 #endif  // MOJO_SERVICES_VIEW_MANAGER_PUBLIC_CPP_VIEW_TRACKER_H_