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

Source/core/events/PromiseRejectionEvent.h

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef PromiseRejectionEvent_h
 #define PromiseRejectionEvent_h
 
 #include "bindings/core/v8/DOMWrapperWorld.h"
 #include "bindings/core/v8/ScopedPersistent.h"
 #include "bindings/core/v8/ScriptPromise.h"
@@ skipping 15 matching lines @@
     static PassRefPtrWillBeRawPtr<PromiseRejectionEvent> create(ScriptState* state, const AtomicString& type, const PromiseRejectionEventInit& initializer)
     {
         return adoptRefWillBeNoop(new PromiseRejectionEvent(state, type, initializer));
     }
 
     ScriptValue reason(ScriptState*) const;
     ScriptPromise promise(ScriptState*) const;
 
     void setWrapperReference(v8::Isolate*, const v8::Persistent<v8::Object>&);
 
-    virtual const AtomicString& interfaceName() const override;
+    const AtomicString& interfaceName() const override;
 
     // PromiseRejectionEvents are similar to ErrorEvents in that they can't be
     // observed across different worlds.
-    virtual bool canBeDispatchedInWorld(const DOMWrapperWorld&) const override;
+    bool canBeDispatchedInWorld(const DOMWrapperWorld&) const override;
 
     DECLARE_VIRTUAL_TRACE();
 
 private:
     PromiseRejectionEvent();
     PromiseRejectionEvent(ScriptState*, const AtomicString&, const PromiseRejectionEventInit&);
     ~PromiseRejectionEvent() override;
 
     static void didCollectPromise(const v8::WeakCallbackInfo<PromiseRejectionEvent>&);
     static void didCollectReason(const v8::WeakCallbackInfo<PromiseRejectionEvent>&);
 
     RefPtr<ScriptState> m_scriptState;
     ScopedPersistent<v8::Value> m_promise;
     ScopedPersistent<v8::Value> m_reason;
 };
 
 } // namespace blink
 
 #endif // PromiseRejectionEvent_h