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

base/synchronization/lock_unittest.cc

Index: base/synchronization/lock_unittest.cc
diff --git a/base/synchronization/lock_unittest.cc b/base/synchronization/lock_unittest.cc
index 161447557fd9fb5922957af687505e114cdfe6d0..967efb8e9237160bea1f190fc64e396347f7cb53 100644
--- a/base/synchronization/lock_unittest.cc
+++ b/base/synchronization/lock_unittest.cc
@@ -18,7 +18,7 @@ class BasicLockTestThread : public PlatformThread::Delegate {
  public:
   explicit BasicLockTestThread(Lock* lock) : lock_(lock), acquired_(0) {}
 
-  virtual void ThreadMain() OVERRIDE {
+  void ThreadMain() override {
     for (int i = 0; i < 10; i++) {
       lock_->Acquire();
       acquired_++;
@@ -93,7 +93,7 @@ class TryLockTestThread : public PlatformThread::Delegate {
  public:
   explicit TryLockTestThread(Lock* lock) : lock_(lock), got_lock_(false) {}
 
-  virtual void ThreadMain() OVERRIDE {
+  void ThreadMain() override {
     got_lock_ = lock_->Try();
     if (got_lock_)
       lock_->Release();
@@ -162,9 +162,7 @@ class MutexLockTestThread : public PlatformThread::Delegate {
     }
   }
 
-  virtual void ThreadMain() OVERRIDE {
-    DoStuff(lock_, value_);
-  }
+  void ThreadMain() override { DoStuff(lock_, value_); }
 
  private:
   Lock* lock_;