Fix virtual/override/final usage in the rest of Source/core/.

Source/core/frame/LocalDOMWindow.cpp

Index: Source/core/frame/LocalDOMWindow.cpp
diff --git a/Source/core/frame/LocalDOMWindow.cpp b/Source/core/frame/LocalDOMWindow.cpp
index 45477c7040b5fc3f6d7694dcad94bc5d86ddba05..b845f637256d2e068dd7e43afc115fba0fcc3cb5 100644
--- a/Source/core/frame/LocalDOMWindow.cpp
+++ b/Source/core/frame/LocalDOMWindow.cpp
@@ -127,7 +127,7 @@ public:
     SecurityOrigin* targetOrigin() const { return m_targetOrigin.get(); }
     ScriptCallStack* stackTrace() const { return m_stackTrace.get(); }
     UserGestureToken* userGestureToken() const { return m_userGestureToken.get(); }
-    virtual void stop() override
+    void stop() override
     {
         SuspendableTimer::stop();
 
@@ -149,7 +149,7 @@ public:
     }
 
 private:
-    virtual void fired() override
+    void fired() override
     {
         InspectorInstrumentationCookie cookie = InspectorInstrumentation::traceAsyncOperationCompletedCallbackStarting(executionContext(), m_asyncOperationId);
         // Prevent calls to stop triggered from the event handler to