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

Source/core/dom/Document.cpp

Index: Source/core/dom/Document.cpp
diff --git a/Source/core/dom/Document.cpp b/Source/core/dom/Document.cpp
index 1c6533cae8149a5d2d52e99a8f7fc0da0a16589f..ecaa70b9d2702d5a6ff20a221c5f33663f012ec8 100644
--- a/Source/core/dom/Document.cpp
+++ b/Source/core/dom/Document.cpp
@@ -377,7 +377,7 @@ static WeakDocumentSet& liveDocumentSet()
 #endif
 
 // This class doesn't work with non-Document ExecutionContext.
-class AutofocusTask FINAL : public ExecutionContextTask {
+class AutofocusTask final : public ExecutionContextTask {
 public:
     static PassOwnPtr<AutofocusTask> create()
     {
@@ -387,7 +387,7 @@ public:
 
 private:
     AutofocusTask() { }
-    virtual void performTask(ExecutionContext* context) OVERRIDE
+    virtual void performTask(ExecutionContext* context) override
     {
         Document* document = toDocument(context);
         if (RefPtrWillBeRawPtr<Element> element = document->autofocusElement()) {