Remove Event.relatedTargetScoped and update event path calculation for relatedTarget

third_party/WebKit/Source/core/events/MouseRelatedEvent.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 Apple Computer, Inc.
  *
  * 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
  * version 2 of the License, or (at your option) any later version.
@@ skipping 53 matching lines @@
     // usable with LayoutObject::absoluteToLocal) relative to view(), i.e. the local frame.
     const LayoutPoint& absoluteLocation() const { return m_absoluteLocation; }
     void setAbsoluteLocation(const LayoutPoint& p) { m_absoluteLocation = p; }
 
     DECLARE_VIRTUAL_TRACE();
 
 protected:
     MouseRelatedEvent();
     // TODO(lanwei): Will make this argument non-optional and all the callers need to provide
     // sourceCapabilities even when it is null, see https://crbug.com/476530.
-    MouseRelatedEvent(const AtomicString& type, bool canBubble, bool cancelable, EventTarget* relatedTarget,
+    MouseRelatedEvent(const AtomicString& type, bool canBubble, bool cancelable,
         AbstractView*, int detail, const IntPoint& screenLocation,
         const IntPoint& rootFrameLocation, const IntPoint& movementDelta, PlatformEvent::Modifiers,
         double platformTimeStamp, PositionType, InputDeviceCapabilities* sourceCapabilities = nullptr);
 
     MouseRelatedEvent(const AtomicString& type, const MouseEventInit& initializer);
 
     void initCoordinates(const LayoutPoint& clientLocation);
     void receivedTarget() final;
 
     void computePageLocation();
     void computeRelativePosition();
 
     // Expose these so MouseEvent::initMouseEvent can set them.
     IntPoint m_screenLocation;
     LayoutPoint m_clientLocation;
     LayoutPoint m_movementDelta;
 
 private:
     LayoutPoint m_pageLocation;
     LayoutPoint m_layerLocation;
     LayoutPoint m_offsetLocation;
     LayoutPoint m_absoluteLocation;
     PositionType m_positionType;
     bool m_hasCachedRelativePosition;
 };
 
 } // namespace blink
 
 #endif // MouseRelatedEvent_h