replace OVERRIDE and FINAL with override and final in ash/

ash/system/chromeos/power/power_event_observer_unittest.cc

Index: ash/system/chromeos/power/power_event_observer_unittest.cc
diff --git a/ash/system/chromeos/power/power_event_observer_unittest.cc b/ash/system/chromeos/power/power_event_observer_unittest.cc
index 30cd2e993ce48d5b8d00f5bd739245c8a4c5c9ae..a0d7d035f75b3c16e656d6f3c41ab856ab7fa1a4 100644
--- a/ash/system/chromeos/power/power_event_observer_unittest.cc
+++ b/ash/system/chromeos/power/power_event_observer_unittest.cc
@@ -18,12 +18,12 @@ class PowerEventObserverTest : public test::AshTestBase {
   virtual ~PowerEventObserverTest() {}
 
   // test::AshTestBase::SetUp() overrides:
-  virtual void SetUp() OVERRIDE {
+  virtual void SetUp() override {
     test::AshTestBase::SetUp();
     observer_.reset(new PowerEventObserver());
   }
 
-  virtual void TearDown() OVERRIDE {
+  virtual void TearDown() override {
     observer_.reset();
     test::AshTestBase::TearDown();
   }