Fix a couple of style nits:

base/message_pump_linux.h

 // Copyright (c) 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 BASE_MESSAGE_PUMP_LINUX_H_
 #define BASE_MESSAGE_PUMP_LINUX_H_
 
 
 #include "base/message_pump.h"
 
 #include "base/memory/scoped_ptr.h"
 #include "base/memory/scoped_vector.h"
 #include "base/message_pump_dispatcher.h"
 #include "base/message_pump_libevent.h"
 #include "base/message_pump_observer.h"
 #include "base/observer_list.h"
 
 namespace base {
 
 // This class implements a message-pump for processing events from input devices
 // Refer to MessagePump for further documentation.
 class BASE_EXPORT MessagePumpLinux : public MessagePumpLibevent,
                                      public MessagePumpDispatcher {
  public:
   MessagePumpLinux();
-  virtual ~MessagePumpLinux();
 
   // Returns the UI message pump.
   static MessagePumpLinux* Current();
 
   // Add/Remove the root window dispatcher.
   void AddDispatcherForRootWindow(MessagePumpDispatcher* dispatcher);
   void RemoveDispatcherForRootWindow(MessagePumpDispatcher* dispatcher);
 
   void RunWithDispatcher(Delegate* delegate, MessagePumpDispatcher* dispatcher);
 
   // Add / remove an Observer, which will start receiving notifications
   // immediately.
   void AddObserver(MessagePumpObserver* observer);
   void RemoveObserver(MessagePumpObserver* observer);
 
   // Overridden from MessagePumpDispatcher.
   virtual bool Dispatch(const base::NativeEvent& event) OVERRIDE;
 
  private:
+  virtual ~MessagePumpLinux();
   std::vector<MessagePumpDispatcher*> dispatcher_;
 
   DISALLOW_COPY_AND_ASSIGN(MessagePumpLinux);
 };
 
 typedef MessagePumpLinux MessagePumpForUI;
 
 }  // namespace base
 
 #endif  // BASE_MESSAGE_PUMP_LINUX_H_