Remove beforeunload events.

sky/engine/core/frame/UseCounter.h

 /*
  * Copyright (C) 2012 Google, 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 103 matching lines @@
         PrefixedMediaGenerateKeyRequest = 72,
         SVGFontElement = 76,
         XMLDocument = 77,
         SVGSwitchElement = 80,
         DocumentAll = 83,
         FormElement = 84,
         DemotedFormElement = 85,
         SVGAnimationElement = 90,
         KeyboardEventKeyLocation = 91,
         LineClamp = 96,
-        SubFrameBeforeUnloadRegistered = 97,
-        SubFrameBeforeUnloadFired = 98,
         TextReplaceWholeText = 100,
         ConsoleMarkTimeline = 102,
         CSSPseudoElementUserAgentCustomPseudo = 103,
         ElementGetAttributeNode = 107, // Removed from DOM4.
         ElementSetAttributeNode = 108, // Removed from DOM4.
         ElementRemoveAttributeNode = 109, // Removed from DOM4.
         DocumentCreateAttribute = 111, // Removed from DOM4.
         DocumentCreateAttributeNS = 112, // Removed from DOM4.
         DocumentInputEncoding = 114, // Removed from DOM4.
         DocumentXMLEncoding = 115, // Removed from DOM4.
@@ skipping 42 matching lines @@
         PrefixedElementRequestFullScreen = 177,
         InputTypeEmailMultiple = 184,
         InputTypeEmailMaxLength = 185,
         InputTypeEmailMultipleMaxLength = 186,
         InputTypeText = 190,
         InputTypeTextMaxLength = 191,
         InputTypePassword = 192,
         InputTypePasswordMaxLength = 193,
         PrefixedPageVisibility = 196,
         CSSStyleSheetInsertRuleOptionalArg = 198, // Inconsistent with the specification and other browsers.
-        DocumentBeforeUnloadRegistered = 200,
-        DocumentBeforeUnloadFired = 201,
         DocumentUnloadRegistered = 202,
         DocumentUnloadFired = 203,
         SVGLocatableNearestViewportElement = 204,
         SVGLocatableFarthestViewportElement = 205,
         HTMLHeadElementProfile = 207,
         OverflowChangedEvent = 208,
         SVGPointMatrixTransform = 209,
         DOMFocusInOutEvent = 211,
         FileGetLastModifiedDate = 212,
         HTMLElementInnerText = 213,
@@ skipping 295 matching lines @@
 
     void updateMeasurements();
 
     OwnPtr<BitVector> m_countBits;
     BitVector m_CSSFeatureBits;
 };
 
 } // namespace blink
 
 #endif // UseCounter_h