Standardize usage of virtual/override/final in mojo/

mojo/edk/system/waiter_test_utils.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_EDK_SYSTEM_WAITER_TEST_UTILS_H_
 #define MOJO_EDK_SYSTEM_WAITER_TEST_UTILS_H_
 
 #include <stdint.h>
 
 #include "base/compiler_specific.h"
@@ skipping 31 matching lines @@
 // |Waiter::Init()|, |AddWaiter()|, and |RemoveWaiter()| are done in the main
 // (test) thread, not the waiter thread (as would actually happen in real code).
 // (We accept this unrealism for simplicity, since |WaiterList| is
 // thread-unsafe so making it more realistic would require adding nontrivial
 // synchronization machinery.)
 class SimpleWaiterThread : public base::SimpleThread {
  public:
   // For the duration of the lifetime of this object, |*result| belongs to it
   // (in the sense that it will write to it whenever it wants).
   SimpleWaiterThread(MojoResult* result, uint32_t* context);
-  virtual ~SimpleWaiterThread();  // Joins the thread.
+  ~SimpleWaiterThread() override;  // Joins the thread.
 
   Waiter* waiter() { return &waiter_; }
 
  private:
-  virtual void Run() override;
+  void Run() override;
 
   MojoResult* const result_;
   uint32_t* const context_;
   Waiter waiter_;
 
   DISALLOW_COPY_AND_ASSIGN(SimpleWaiterThread);
 };
 
 // This is a more complex and realistic thread that has a |Waiter|, on which it
 // waits for the given deadline (with the given flags). Unlike
 // |SimpleWaiterThread|, it requires the machinery of |Dispatcher|.
 class WaiterThread : public base::SimpleThread {
  public:
   // Note: |*did_wait_out|, |*result_out|, |*context_out| and
   // |*signals_state_out| "belong" to this object (i.e., may be modified by, on
   // some other thread) while it's alive.
   WaiterThread(scoped_refptr<Dispatcher> dispatcher,
                MojoHandleSignals handle_signals,
                MojoDeadline deadline,
                uint32_t context,
                bool* did_wait_out,
                MojoResult* result_out,
                uint32_t* context_out,
                HandleSignalsState* signals_state_out);
-  virtual ~WaiterThread();
+  ~WaiterThread() override;
 
  private:
-  virtual void Run() override;
+  void Run() override;
 
   const scoped_refptr<Dispatcher> dispatcher_;
   const MojoHandleSignals handle_signals_;
   const MojoDeadline deadline_;
   const uint32_t context_;
   bool* const did_wait_out_;
   MojoResult* const result_out_;
   uint32_t* const context_out_;
   HandleSignalsState* const signals_state_out_;
 
   Waiter waiter_;
 
   DISALLOW_COPY_AND_ASSIGN(WaiterThread);
 };
 
 }  // namespace test
 }  // namespace system
 }  // namespace mojo
 
 #endif  // MOJO_EDK_SYSTEM_WAITER_TEST_UTILS_H_