Enumerate the return value of dispatchEvent so it is clear.

third_party/WebKit/Source/core/events/InputEvent.h

 // Copyright 2016 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 InputEvent_h
 #define InputEvent_h
 
 #include "core/events/InputEventInit.h"
 #include "core/events/UIEvent.h"
 
 namespace blink {
 
 class InputEvent final : public UIEvent {
     DEFINE_WRAPPERTYPEINFO();
 
 public:
     static PassRefPtrWillBeRawPtr<InputEvent> create()
     {
         return adoptRefWillBeNoop(new InputEvent);
     }
 
     static PassRefPtrWillBeRawPtr<InputEvent> create(const AtomicString& type, const InputEventInit& initializer)
     {
         return adoptRefWillBeNoop(new InputEvent(type, initializer));
     }
 
     bool isInputEvent() const override;
 
-    PassRefPtrWillBeRawPtr<EventDispatchMediator> createMediator() override;
-
     DECLARE_VIRTUAL_TRACE();
 
 private:
     InputEvent();
     InputEvent(const AtomicString&, const InputEventInit&);
 };
 
-class InputEventDispatchMediator final : public EventDispatchMediator {
-public:
-    static PassRefPtrWillBeRawPtr<InputEventDispatchMediator> create(PassRefPtrWillBeRawPtr<InputEvent>);
-
-private:
-    explicit InputEventDispatchMediator(PassRefPtrWillBeRawPtr<InputEvent>);
-    InputEvent& event() const;
-    bool dispatchEvent(EventDispatcher&) const override;
-};
-
 DEFINE_EVENT_TYPE_CASTS(InputEvent);
 
 } // namespace blink
 
 #endif // InputEvent_h