Add OVERRIDE to ui/.

ui/base/test/ui_cocoa_test_helper.h

Index: ui/base/test/ui_cocoa_test_helper.h
diff --git a/ui/base/test/ui_cocoa_test_helper.h b/ui/base/test/ui_cocoa_test_helper.h
index 9b1c5132b71b8740661e4a3c3a45911701640ce0..ba0d50487a5e81adc66b7fe16da2bdb474699927 100644
--- a/ui/base/test/ui_cocoa_test_helper.h
+++ b/ui/base/test/ui_cocoa_test_helper.h
@@ -10,6 +10,7 @@
 
 #import <Cocoa/Cocoa.h>
 
+#include "base/compiler_specific.h"
 #import "base/mac/scoped_nsautorelease_pool.h"
 #include "testing/platform_test.h"
 
@@ -59,7 +60,7 @@ class CocoaTest : public PlatformTest {
   // to close them before CocoaTest::TearDown is called. A standard way of doing
   // this would be to create them in SetUp (after calling CocoaTest::Setup) and
   // then close them in TearDown before calling CocoaTest::TearDown.
-  virtual void TearDown();
+  virtual void TearDown() OVERRIDE;
 
   // Retuns a test window that can be used by views and other UI objects
   // as part of their tests. Is created lazily, and will be closed correctly