Remove Event.relatedTargetScoped and update event path calculation for relatedTarget

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

 /*
  * Copyright (C) 2006, 2007, 2009, 2011 Apple Inc. All rights reserved.
  * Copyright (C) 2006 Samuel Weinig <sam.weinig@gmail.com>
  *
  * 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.
  *
  * This library is distributed in the hope that it will be useful,
@@ skipping 25 matching lines @@
 
     void stopPropagation();
     void stopImmediatePropagation();
 
     readonly attribute boolean bubbles;
     readonly attribute boolean cancelable;
     void preventDefault();
     readonly attribute boolean defaultPrevented;
 
     [RuntimeEnabled=ShadowDOMV1, MeasureAs=EventComposed] readonly attribute boolean composed;
-    [RuntimeEnabled=ShadowDOMV1, MeasureAs=EventRelatedTargetScoped] readonly attribute boolean relatedTargetScoped;
 
     [Unforgeable] readonly attribute boolean isTrusted;
 
     // TODO(majidvp): At the moment the actual return value type can either
     // be: 
     //  - DOMTimeStamp (i.e. long long): legacy type
     //  - DOMHighResTimeStamp (i.e. double):  HighResEventTimeStamp REF is 
     //    enabled 
     // Below IDL definition uses DOMHighResTimeStamp because all DOMTimeStamp
     // values can be represented in double type without any loss of precision.
@@ skipping 25 matching lines @@
     const unsigned short KEYPRESS  = 1024;
     const unsigned short DRAGDROP  = 2048;
     const unsigned short FOCUS     = 4096;
     const unsigned short BLUR      = 8192;
     const unsigned short SELECT    = 16384;
     const unsigned short CHANGE    = 32768;
     [MeasureAs=EventSrcElement] readonly attribute EventTarget srcElement;
     [MeasureAs=EventReturnValue, CallWith=ExecutionContext, ImplementedAs=legacyReturnValue] attribute boolean returnValue;
     [MeasureAs=EventCancelBubble, CallWith=ExecutionContext] attribute boolean cancelBubble;
 };