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

Source/core/frame/DOMWindow.h

Index: Source/core/frame/DOMWindow.h
diff --git a/Source/core/frame/DOMWindow.h b/Source/core/frame/DOMWindow.h
index f2f2ac4ecb1da6feaaa2352a658619efc921744e..e5a8dadd68e1b15a1f2e70d76fce7fdcfb3cfa5f 100644
--- a/Source/core/frame/DOMWindow.h
+++ b/Source/core/frame/DOMWindow.h
@@ -43,7 +43,7 @@ class CORE_EXPORT DOMWindow : public EventTargetWithInlineData, public RefCounte
     DEFINE_WRAPPERTYPEINFO();
     REFCOUNTED_EVENT_TARGET(DOMWindow);
 public:
-    virtual ~DOMWindow();
+    ~DOMWindow() override;
 
     // RefCountedWillBeGarbageCollectedFinalized overrides:
     DECLARE_VIRTUAL_TRACE();
@@ -54,8 +54,8 @@ public:
     virtual Frame* frame() const = 0;
 
     // ScriptWrappable overrides:
-    v8::Local<v8::Object> wrap(v8::Isolate*, v8::Local<v8::Object> creationContext) override final;
-    v8::Local<v8::Object> associateWithWrapper(v8::Isolate*, const WrapperTypeInfo*, v8::Local<v8::Object> wrapper) override final;
+    v8::Local<v8::Object> wrap(v8::Isolate*, v8::Local<v8::Object> creationContext) final;
+    v8::Local<v8::Object> associateWithWrapper(v8::Isolate*, const WrapperTypeInfo*, v8::Local<v8::Object> wrapper) final;
 
     // EventTarget overrides:
     const AtomicString& interfaceName() const override;