Replace FINAL and OVERRIDE with their C++11 counterparts in Source/core/testing

Source/core/testing/MockPagePopupDriver.cpp

Index: Source/core/testing/MockPagePopupDriver.cpp
diff --git a/Source/core/testing/MockPagePopupDriver.cpp b/Source/core/testing/MockPagePopupDriver.cpp
index da705ba19446921e55de4cf4e7c8e9a48510382b..aaaff31f1649430d4f91800afcc515d6de8f2657 100644
--- a/Source/core/testing/MockPagePopupDriver.cpp
+++ b/Source/core/testing/MockPagePopupDriver.cpp
@@ -49,7 +49,7 @@ public:
 private:
     MockPagePopup(PagePopupClient*, const IntRect& originBoundsInRootView, LocalFrame*);
     void close(Timer<MockPagePopup>*);
-    virtual AXObject* rootAXObject() OVERRIDE { return 0; }
+    virtual AXObject* rootAXObject() override { return 0; }
 
     PagePopupClient* m_popupClient;
     RefPtrWillBePersistent<HTMLIFrameElement> m_iframe;