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

base/threading/thread_unittest.cc

Index: base/threading/thread_unittest.cc
diff --git a/base/threading/thread_unittest.cc b/base/threading/thread_unittest.cc
index 8bd817c75bcda1d7d5b867b40bb5effc74fca445..6cab24ef5adace0ebd842bb1d560111f973f6cf9 100644
--- a/base/threading/thread_unittest.cc
+++ b/base/threading/thread_unittest.cc
@@ -35,7 +35,7 @@ class SleepInsideInitThread : public Thread {
     Stop();
   }
 
-  virtual void Init() OVERRIDE {
+  void Init() override {
     base::PlatformThread::Sleep(base::TimeDelta::FromMilliseconds(500));
     init_called_ = true;
   }
@@ -74,13 +74,9 @@ class CaptureToEventList : public Thread {
     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_;
@@ -97,7 +93,7 @@ class CapturingDestructionObserver
   }
 
   // DestructionObserver implementation:
-  virtual void WillDestroyCurrentMessageLoop() OVERRIDE {
+  void WillDestroyCurrentMessageLoop() override {
     event_list_->push_back(THREAD_EVENT_MESSAGE_LOOP_DESTROYED);
     event_list_ = NULL;
   }