Remove setting cancelBubble to false.

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

 /*
  * Copyright (C) 2001 Peter Kelly (pmk@post.com)
  * Copyright (C) 2001 Tobias Anton (anton@stud.fbi.fh-darmstadt.de)
  * Copyright (C) 2006 Samuel Weinig (sam.weinig@gmail.com)
  * Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008 Apple Inc. All rights
  * reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
@@ skipping 181 matching lines @@
   bool defaultPrevented() const { return m_defaultPrevented; }
   virtual void preventDefault();
   void setDefaultPrevented(bool defaultPrevented) {
     m_defaultPrevented = defaultPrevented;
   }
 
   bool defaultHandled() const { return m_defaultHandled; }
   void setDefaultHandled() { m_defaultHandled = true; }
 
   bool cancelBubble(ExecutionContext* = nullptr) const {
-    return m_cancelBubble;
+    return propagationStopped();
   }
   void setCancelBubble(ExecutionContext*, bool);
 
   Event* underlyingEvent() const { return m_underlyingEvent.get(); }
   void setUnderlyingEvent(Event*);
 
   bool hasEventPath() { return m_eventPath; }
   EventPath& eventPath() {
     DCHECK(m_eventPath);
     return *m_eventPath;
@@ skipping 65 matching lines @@
   AtomicString m_type;
   unsigned m_canBubble : 1;
   unsigned m_cancelable : 1;
   unsigned m_composed : 1;
   unsigned m_isEventTypeScopedInV0 : 1;
 
   unsigned m_propagationStopped : 1;
   unsigned m_immediatePropagationStopped : 1;
   unsigned m_defaultPrevented : 1;
   unsigned m_defaultHandled : 1;
-  unsigned m_cancelBubble : 1;
   unsigned m_wasInitialized : 1;
   unsigned m_isTrusted : 1;
 
   // Whether preventDefault was called when |m_handlingPassive| is
   // true. This field is reset on each call to setHandlingPassive.
   unsigned m_preventDefaultCalledDuringPassive : 1;
   // Whether preventDefault was called on uncancelable event.
   unsigned m_preventDefaultCalledOnUncancelableEvent : 1;
 
   PassiveMode m_handlingPassive;
   unsigned short m_eventPhase;
   Member<EventTarget> m_currentTarget;
   Member<EventTarget> m_target;
   Member<Event> m_underlyingEvent;
   Member<EventPath> m_eventPath;
   // The monotonic platform time in seconds, for input events it is the
   // event timestamp provided by the host OS and reported in the original
   // WebInputEvent instance.
   TimeTicks m_platformTimeStamp;
 };
 
 #define DEFINE_EVENT_TYPE_CASTS(typeName)                          \
   DEFINE_TYPE_CASTS(typeName, Event, event, event->is##typeName(), \
                     event.is##typeName())
 
 }  // namespace blink
 
 #endif  // Event_h