Standardize usage of virtual/override/final in chrome/

chrome/common/service_process_util_posix.h

Index: chrome/common/service_process_util_posix.h
diff --git a/chrome/common/service_process_util_posix.h b/chrome/common/service_process_util_posix.h
index 393e53ee5c6209822623de31066ac567d9502c7a..9eb14913c1a593ffb1112a0c81a8f329fe4acfdb 100644
--- a/chrome/common/service_process_util_posix.h
+++ b/chrome/common/service_process_util_posix.h
@@ -46,11 +46,11 @@ class ServiceProcessTerminateMonitor : public base::MessageLoopForIO::Watcher {
   };
 
   explicit ServiceProcessTerminateMonitor(const base::Closure& terminate_task);
-  virtual ~ServiceProcessTerminateMonitor();
+  ~ServiceProcessTerminateMonitor() override;
 
   // MessageLoopForIO::Watcher overrides
-  virtual void OnFileCanReadWithoutBlocking(int fd) override;
-  virtual void OnFileCanWriteWithoutBlocking(int fd) override;
+  void OnFileCanReadWithoutBlocking(int fd) override;
+  void OnFileCanWriteWithoutBlocking(int fd) override;
 
  private:
   base::Closure terminate_task_;