Remove HiResEventTimeStamp runtime flag (status=stable)

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 28 matching lines @@
 
     readonly attribute boolean bubbles;
     readonly attribute boolean cancelable;
     void preventDefault();
     readonly attribute boolean defaultPrevented;
 
     [RuntimeEnabled=ShadowDOMV1, MeasureAs=EventComposed] readonly attribute boolean composed;
 
     [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.
-    // Once the feature is enabled by default the return value type will always
-    // match the definition here.
     [CallWith=ScriptState] readonly attribute DOMHighResTimeStamp timeStamp;
 
     // FIXME: initEvent()'s arguments should not be optional.
     [Measure] void initEvent([Default=Undefined] optional DOMString type,
                              [Default=Undefined] optional boolean bubbles,
                              [Default=Undefined] optional boolean cancelable);
 
     // Shadow DOM
     // https://w3c.github.io/webcomponents/spec/shadow/#extensions-to-event-interface
     [MeasureAs=EventPath, CallWith=ScriptState] readonly attribute EventTarget[] path;
@@ skipping 13 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;
 };