Drop DocumentCreateEventVRDisplayEvent

third_party/WebKit/Source/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 1267 matching lines @@
         HTMLBodyElementOnSelectionChangeAttribute = 1508,
         ForeignFetchInterception = 1509,
         MapNameMatchingStrict = 1510,
         MapNameMatchingASCIICaseless = 1511,
         MapNameMatchingUnicodeLower = 1512,
         RadioNameMatchingStrict = 1513,
         RadioNameMatchingASCIICaseless = 1514,
         RadioNameMatchingCaseFolding = 1515,
         NavigatorPointerEnabled = 1516,
         InputSelectionGettersThrow = 1517,
-        DocumentCreateEventVRDisplayEvent = 1518,
         UsbGetDevices = 1519,
         UsbRequestDevice = 1520,
         UsbDeviceOpen = 1521,
         UsbDeviceClose = 1522,
         UsbDeviceSelectConfiguration = 1523,
         UsbDeviceClaimInterface = 1524,
         UsbDeviceReleaseInterface = 1525,
         UsbDeviceSelectAlternateInterface = 1526,
         UsbDeviceControlTransferIn = 1527,
         UsbDeviceControlTransferOut = 1528,
         UsbDeviceClearHalt = 1529,
         UsbDeviceTransferIn = 1530,
         UsbDeviceTransferOut = 1531,
         UsbDeviceIsochronousTransferIn = 1532,
         UsbDeviceIsochronousTransferOut = 1533,
         UsbDeviceReset = 1534,
+        // The above items are available in M54 branch
+
         PointerEnterLeaveFired = 1535,
         PointerOverOutFired = 1536,
         PointerEnterLeaveFiredWhileCaptured = 1537,
         PointerOverOutFiredWhileCaptured = 1538,
         DraggableAttribute = 1539,
 
         // Add new features immediately above this line. Don't change assigned
         // numbers of any item, and don't reuse removed slots.
         // Also, run update_use_counter_feature_enum.py in chromium/src/tools/metrics/histograms/
         // to update the UMA mapping.
@@ skipping 48 matching lines @@
     friend class UseCounterTest;
     unsigned m_muteCount;
 
     BitVector m_featureBits;
     BitVector m_CSSFeatureBits;
 };
 
 } // namespace blink
 
 #endif // UseCounter_h