Standardize usage of virtual/override/final in mojo/

mojo/common/message_pump_mojo.h

 // Copyright 2013 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_COMMON_MESSAGE_PUMP_MOJO_H_
 #define MOJO_COMMON_MESSAGE_PUMP_MOJO_H_
 
 #include <map>
 
 #include "base/macros.h"
@@ skipping 18 matching lines @@
     Observer() {}
 
     virtual void WillSignalHandler() = 0;
     virtual void DidSignalHandler() = 0;
 
    protected:
     virtual ~Observer() {}
   };
 
   MessagePumpMojo();
-  virtual ~MessagePumpMojo();
+  ~MessagePumpMojo() override;
 
   // Static factory function (for using with |base::Thread::Options|, wrapped
   // using |base::Bind()|).
   static scoped_ptr<base::MessagePump> Create();
 
   // Returns the MessagePumpMojo instance of the current thread, if it exists.
   static MessagePumpMojo* current();
 
   static bool IsCurrent() { return !!current(); }
 
   // Registers a MessagePumpMojoHandler for the specified handle. Only one
   // handler can be registered for a specified handle.
   // NOTE: a value of 0 for |deadline| indicates an indefinite timeout.
   void AddHandler(MessagePumpMojoHandler* handler,
                   const Handle& handle,
                   MojoHandleSignals wait_signals,
                   base::TimeTicks deadline);
 
   void RemoveHandler(const Handle& handle);
 
   void AddObserver(Observer*);
   void RemoveObserver(Observer*);
 
   // MessagePump:
-  virtual void Run(Delegate* delegate) override;
-  virtual void Quit() override;
-  virtual void ScheduleWork() override;
-  virtual void ScheduleDelayedWork(
-      const base::TimeTicks& delayed_work_time) override;
+  void Run(Delegate* delegate) override;
+  void Quit() override;
+  void ScheduleWork() override;
+  void ScheduleDelayedWork(const base::TimeTicks& delayed_work_time) override;
 
  private:
   struct RunState;
   struct WaitState;
 
   // Contains the data needed to track a request to AddHandler().
   struct Handler {
     Handler() : handler(NULL), wait_signals(MOJO_HANDLE_SIGNAL_NONE), id(0) {}
 
     MessagePumpMojoHandler* handler;
@@ skipping 47 matching lines @@
 
   ObserverList<Observer> observers_;
 
   DISALLOW_COPY_AND_ASSIGN(MessagePumpMojo);
 };
 
 }  // namespace common
 }  // namespace mojo
 
 #endif  // MOJO_COMMON_MESSAGE_PUMP_MOJO_H_