Prevent propagation of wheel events to dispatch event in parent iframe.

third_party/WebKit/Source/core/input/EventHandler.h

 /*
  * Copyright (C) 2006, 2007, 2009, 2010, 2011 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 300 matching lines @@
     WebInputEventResult dispatchDragSrcEvent(const AtomicString& eventType, const PlatformMouseEvent&);
 
     bool dragHysteresisExceeded(const IntPoint&) const;
 
     WebInputEventResult passMousePressEventToSubframe(MouseEventWithHitTestResults&, LocalFrame* subframe);
     WebInputEventResult passMouseMoveEventToSubframe(MouseEventWithHitTestResults&, LocalFrame* subframe, HitTestResult* hoveredNode = nullptr);
     WebInputEventResult passMouseReleaseEventToSubframe(MouseEventWithHitTestResults&, LocalFrame* subframe);
 
     bool passMousePressEventToScrollbar(MouseEventWithHitTestResults&);
 
-    WebInputEventResult passWheelEventToWidget(const PlatformWheelEvent&, Widget&);
     void defaultSpaceEventHandler(KeyboardEvent*);
     void defaultBackspaceEventHandler(KeyboardEvent*);
     void defaultTabEventHandler(KeyboardEvent*);
     void defaultEscapeEventHandler(KeyboardEvent*);
     void defaultArrowEventHandler(WebFocusType, KeyboardEvent*);
 
     void updateLastScrollbarUnderMouse(Scrollbar*, bool);
 
     void setFrameWasScrolledByUser();
 
@@ skipping 124 matching lines @@
     // scroll which shouldn't propagate can't cause any element to
     // scroll other than the |m_previousGestureScrolledNode|.
     bool m_deltaConsumedForScrollSequence;
 };
 
 } // namespace blink
 
 WTF_ALLOW_INIT_WITH_MEM_FUNCTIONS(blink::EventHandler::TouchInfo);
 
 #endif // EventHandler_h