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

Source/core/dom/MainThreadTaskRunnerTest.cpp

Index: Source/core/dom/MainThreadTaskRunnerTest.cpp
diff --git a/Source/core/dom/MainThreadTaskRunnerTest.cpp b/Source/core/dom/MainThreadTaskRunnerTest.cpp
index 94258bc3969bb1a360ee2ccc3680237003371e8f..e2228145641fd7e0d4ed8f94969d6dcf767bda21 100644
--- a/Source/core/dom/MainThreadTaskRunnerTest.cpp
+++ b/Source/core/dom/MainThreadTaskRunnerTest.cpp
@@ -41,7 +41,7 @@ using namespace blink;
 
 namespace {
 
-class MarkingBooleanTask FINAL : public ExecutionContextTask {
+class MarkingBooleanTask final : public ExecutionContextTask {
 public:
     static PassOwnPtr<MarkingBooleanTask> create(bool* toBeMarked)
     {
@@ -54,7 +54,7 @@ public:
 private:
     MarkingBooleanTask(bool* toBeMarked) : m_toBeMarked(toBeMarked) { }
 
-    virtual void performTask(ExecutionContext* context) OVERRIDE
+    virtual void performTask(ExecutionContext* context) override
     {
         *m_toBeMarked = true;
     }