Standardize usage of virtual/override/final in base/

base/threading/thread_unittest.cc

 // 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.
 
 #include "base/threading/thread.h"
 
 #include <vector>
 
 #include "base/bind.h"
 #include "base/message_loop/message_loop.h"
@@ skipping 13 matching lines @@
   *value = !*value;
 }
 
 class SleepInsideInitThread : public Thread {
  public:
   SleepInsideInitThread() : Thread("none") {
     init_called_ = false;
     ANNOTATE_BENIGN_RACE(
         this, "Benign test-only data race on vptr - http://crbug.com/98219");
   }
-  virtual ~SleepInsideInitThread() {
-    Stop();
-  }
+  ~SleepInsideInitThread() override { Stop(); }
 
-  virtual void Init() override {
+  void Init() override {
     base::PlatformThread::Sleep(base::TimeDelta::FromMilliseconds(500));
     init_called_ = true;
   }
   bool InitCalled() { return init_called_; }
  private:
   bool init_called_;
 };
 
 enum ThreadEvent {
   // Thread::Init() was called.
@@ skipping 14 matching lines @@
 class CaptureToEventList : public Thread {
  public:
   // This Thread pushes events into the vector |event_list| to show
   // the order they occured in. |event_list| must remain valid for the
   // lifetime of this thread.
   explicit CaptureToEventList(EventList* event_list)
       : Thread("none"),
         event_list_(event_list) {
   }
 
-  virtual ~CaptureToEventList() {
-    Stop();
-  }
+  ~CaptureToEventList() override { Stop(); }
 
-  virtual void Init() override {
-    event_list_->push_back(THREAD_EVENT_INIT);
-  }
+  void Init() override { event_list_->push_back(THREAD_EVENT_INIT); }
 
-  virtual void CleanUp() override {
-    event_list_->push_back(THREAD_EVENT_CLEANUP);
-  }
+  void CleanUp() override { event_list_->push_back(THREAD_EVENT_CLEANUP); }
 
  private:
   EventList* event_list_;
 };
 
 // Observer that writes a value into |event_list| when a message loop has been
 // destroyed.
 class CapturingDestructionObserver
     : public base::MessageLoop::DestructionObserver {
  public:
   // |event_list| must remain valid throughout the observer's lifetime.
   explicit CapturingDestructionObserver(EventList* event_list)
       : event_list_(event_list) {
   }
 
   // DestructionObserver implementation:
-  virtual void WillDestroyCurrentMessageLoop() override {
+  void WillDestroyCurrentMessageLoop() override {
     event_list_->push_back(THREAD_EVENT_MESSAGE_LOOP_DESTROYED);
     event_list_ = NULL;
   }
 
  private:
   EventList* event_list_;
 };
 
 // Task that adds a destruction observer to the current message loop.
 void RegisterDestructionObserver(
@@ skipping 119 matching lines @@
 
     // Upon leaving this scope, the thread is deleted.
   }
 
   // Check the order of events during shutdown.
   ASSERT_EQ(static_cast<size_t>(THREAD_NUM_EVENTS), captured_events.size());
   EXPECT_EQ(THREAD_EVENT_INIT, captured_events[0]);
   EXPECT_EQ(THREAD_EVENT_CLEANUP, captured_events[1]);
   EXPECT_EQ(THREAD_EVENT_MESSAGE_LOOP_DESTROYED, captured_events[2]);
 }