Fix virtual/override/final usage in Source/modules/.

Source/modules/serviceworkers/RespondWithObserver.cpp

 // Copyright 2014 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.
 
 #include "config.h"
 #include "modules/serviceworkers/RespondWithObserver.h"
 
 #include "bindings/core/v8/ScriptFunction.h"
 #include "bindings/core/v8/ScriptPromise.h"
 #include "bindings/core/v8/ScriptValue.h"
@@ skipping 33 matching lines @@
     }
 
 private:
     ThenFunction(ScriptState* scriptState, RespondWithObserver* observer, ResolveType type)
         : ScriptFunction(scriptState)
         , m_observer(observer)
         , m_resolveType(type)
     {
     }
 
-    virtual ScriptValue call(ScriptValue value) override
+    ScriptValue call(ScriptValue value) override
     {
         ASSERT(m_observer);
         ASSERT(m_resolveType == Fulfilled || m_resolveType == Rejected);
         if (m_resolveType == Rejected) {
             m_observer->responseWasRejected(WebServiceWorkerResponseErrorPromiseRejected);
             value = ScriptPromise::reject(value.scriptState(), value).scriptValue();
         } else {
             m_observer->responseWasFulfilled(value);
         }
         m_observer = nullptr;
@@ skipping 117 matching lines @@
     , m_state(Initial)
 {
 }
 
 DEFINE_TRACE(RespondWithObserver)
 {
     ContextLifecycleObserver::trace(visitor);
 }
 
 } // namespace blink