Standardize usage of virtual/override/final in content/

content/public/common/child_process_host_delegate.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 CONTENT_PUBLIC_COMMON_CHILD_PROCESS_HOST_DELEGATE_H_
 #define CONTENT_PUBLIC_COMMON_CHILD_PROCESS_HOST_DELEGATE_H_
 
 #include <string>
 
 #include "base/process/process.h"
 #include "content/common/content_export.h"
 #include "ipc/ipc_listener.h"
 
 namespace content {
 
 // Interface that all users of ChildProcessHost need to provide.
 class ChildProcessHostDelegate : public IPC::Listener {
  public:
-  virtual ~ChildProcessHostDelegate() {}
+  ~ChildProcessHostDelegate() override {}
 
   // Delegates return true if it's ok to shut down the child process (which is
   // the default return value). The exception is if the host is in the middle of
   // sending a request to the process, in which case the other side might think
   // it's ok to shutdown, when really it's not.
   CONTENT_EXPORT virtual bool CanShutdown();
 
   // Called when the child process unexpected closes the IPC channel. Delegates
   // would normally delete the object in this case.
   virtual void OnChildDisconnected() {}
 
   // Returns the handle of the child process. This can be called only after
   // OnProcessLaunched is called or it will be invalid and may crash.
   virtual base::ProcessHandle GetHandle() const = 0;
 };
 
 };  // namespace content
 
 #endif  // CONTENT_PUBLIC_COMMON_CHILD_PROCESS_HOST_DELEGATE_H_