replace 'virtual ... OVERRIDE' with '... override'

base/threading/thread_perftest.cc

Index: base/threading/thread_perftest.cc
diff --git a/base/threading/thread_perftest.cc b/base/threading/thread_perftest.cc
index 088f62955c3d16a08360f16bcc11e23c215e58d4..64d2ce848ae338ac607238b1e7697cf6d05f2d87 100644
--- a/base/threading/thread_perftest.cc
+++ b/base/threading/thread_perftest.cc
@@ -123,7 +123,7 @@ class TaskPerfTest : public ThreadPerfTest {
     return threads_[count % threads_.size()];
   }
 
-  virtual void PingPong(int hops) OVERRIDE {
+  void PingPong(int hops) override {
     if (!hops) {
       FinishMeasurement();
       return;
@@ -149,16 +149,14 @@ TEST_F(TaskPerfTest, TaskPingPong) {
 // Same as above, but add observers to test their perf impact.
 class MessageLoopObserver : public base::MessageLoop::TaskObserver {
  public:
-  virtual void WillProcessTask(const base::PendingTask& pending_task) OVERRIDE {
-  }
-  virtual void DidProcessTask(const base::PendingTask& pending_task) OVERRIDE {
-  }
+  void WillProcessTask(const base::PendingTask& pending_task) override {}
+  void DidProcessTask(const base::PendingTask& pending_task) override {}
 };
 MessageLoopObserver message_loop_observer;
 
 class TaskObserverPerfTest : public TaskPerfTest {
  public:
-  virtual void Init() OVERRIDE {
+  void Init() override {
     TaskPerfTest::Init();
     for (size_t i = 0; i < threads_.size(); i++) {
       threads_[i]->message_loop()->AddTaskObserver(&message_loop_observer);
@@ -176,12 +174,12 @@ TEST_F(TaskObserverPerfTest, TaskPingPong) {
 template <typename WaitableEventType>
 class EventPerfTest : public ThreadPerfTest {
  public:
-  virtual void Init() OVERRIDE {
+  void Init() override {
     for (size_t i = 0; i < threads_.size(); i++)
       events_.push_back(new WaitableEventType(false, false));
   }
 
-  virtual void Reset() OVERRIDE { events_.clear(); }
+  void Reset() override { events_.clear(); }
 
   void WaitAndSignalOnThread(size_t event) {
     size_t next_event = (event + 1) % events_.size();
@@ -197,7 +195,7 @@ class EventPerfTest : public ThreadPerfTest {
       FinishMeasurement();
   }
 
-  virtual void PingPong(int hops) OVERRIDE {
+  void PingPong(int hops) override {
     remaining_hops_ = hops;
     for (size_t i = 0; i < threads_.size(); i++) {
       threads_[i]->message_loop_proxy()->PostTask(