Standardize usage of virtual/override/final in mojo/

mojo/shell/in_process_dynamic_service_runner.h

Index: mojo/shell/in_process_dynamic_service_runner.h
diff --git a/mojo/shell/in_process_dynamic_service_runner.h b/mojo/shell/in_process_dynamic_service_runner.h
index 0e0cade3c46f3b179d2da3c4b74d4a6023dd63a3..9b93ded9131c78726610a05f19d0d20231c9d910 100644
--- a/mojo/shell/in_process_dynamic_service_runner.h
+++ b/mojo/shell/in_process_dynamic_service_runner.h
@@ -22,16 +22,16 @@ class InProcessDynamicServiceRunner
       public base::DelegateSimpleThread::Delegate {
  public:
   explicit InProcessDynamicServiceRunner(Context* context);
-  virtual ~InProcessDynamicServiceRunner();
+  ~InProcessDynamicServiceRunner() override;
 
   // |DynamicServiceRunner| method:
-  virtual void Start(const base::FilePath& app_path,
-                     ScopedMessagePipeHandle service_handle,
-                     const base::Closure& app_completed_callback) override;
+  void Start(const base::FilePath& app_path,
+             ScopedMessagePipeHandle service_handle,
+             const base::Closure& app_completed_callback) override;
 
  private:
   // |base::DelegateSimpleThread::Delegate| method:
-  virtual void Run() override;
+  void Run() override;
 
   base::FilePath app_path_;
   ScopedMessagePipeHandle service_handle_;