Add more missing closing namespace comments.

third_party/WebKit/Source/modules/EventModulesFactory.h

 // Copyright (c) 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.
 
 #ifndef EventModulesFactory_h
 #define EventModulesFactory_h
 
 #include "core/events/EventFactory.h"
 #include "platform/heap/Handle.h"
 #include "wtf/PassRefPtr.h"
 #include "wtf/text/AtomicString.h"
 
 namespace blink {
 
 class Event;
 
 class EventModulesFactory final : public EventFactoryBase {
 public:
     static PassOwnPtr<EventModulesFactory> create()
     {
         return adoptPtr(new EventModulesFactory());
     }
 
     PassRefPtrWillBeRawPtr<Event> create(const String& eventType) override;
 };
 
-}
+} // namespace blink
 
 #endif