Standardize usage of virtual/override/final in mojo/

mojo/public/cpp/bindings/lib/router.cc

 // 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.
 
 #include "mojo/public/cpp/bindings/lib/router.h"
 
 #include "mojo/public/cpp/environment/logging.h"
 
 namespace mojo {
 namespace internal {
 
 // ----------------------------------------------------------------------------
 
 class ResponderThunk : public MessageReceiver {
  public:
   explicit ResponderThunk(const SharedData<Router*>& router)
       : router_(router) {}
-  virtual ~ResponderThunk() {}
+  ~ResponderThunk() override {}
 
   // MessageReceiver implementation:
-  virtual bool Accept(Message* message) override {
+  bool Accept(Message* message) override {
     MOJO_DCHECK(message->has_flag(kMessageIsResponse));
 
     bool result = false;
 
     Router* router = router_.value();
     if (router)
       result = router->Accept(message);
 
     return result;
   }
@@ skipping 99 matching lines @@
     // OK to drop message on the floor.
   }
 
   return false;
 }
 
 // ----------------------------------------------------------------------------
 
 }  // namespace internal
 }  // namespace mojo