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

Source/core/dom/StringCallback.cpp

Index: Source/core/dom/StringCallback.cpp
diff --git a/Source/core/dom/StringCallback.cpp b/Source/core/dom/StringCallback.cpp
index 85481e4b864fad912f7254c1546bb54982e2be78..aa8544cf6456ab6eedf5b7e0292b1805bd1a8b82 100644
--- a/Source/core/dom/StringCallback.cpp
+++ b/Source/core/dom/StringCallback.cpp
@@ -39,19 +39,19 @@ namespace blink {
 
 namespace {
 
-class DispatchCallbackTask FINAL : public ExecutionContextTask {
+class DispatchCallbackTask final : public ExecutionContextTask {
 public:
     static PassOwnPtr<DispatchCallbackTask> create(StringCallback* callback, const String& data, const String& taskName)
     {
         return adoptPtr(new DispatchCallbackTask(callback, data, taskName));
     }
 
-    virtual void performTask(ExecutionContext*) OVERRIDE
+    virtual void performTask(ExecutionContext*) override
     {
         m_callback->handleEvent(m_data);
     }
 
-    virtual String taskNameForInstrumentation() const OVERRIDE
+    virtual String taskNameForInstrumentation() const override
     {
         return m_taskName;
     }