*** DO NOT LAND *** Remove regions support, keeping a bare minimum to support "region-based"...

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 239 matching lines @@
         CSSStyleDeclarationFloatPropertyName, // Pending removal in CSSOM.
         InputTypeText,
         InputTypeTextMaxLength,
         InputTypePassword,
         InputTypePasswordMaxLength,
         SVGInstanceRoot,
         ShowModalDialog,
         PrefixedPageVisibility,
         HTMLFrameElementLocation,
         CSSStyleSheetInsertRuleOptionalArg, // Inconsistent with the specification and other browsers.
-        CSSWebkitRegionAtRule, // @region rule changed to ::region()
         DocumentBeforeUnloadRegistered,
         DocumentBeforeUnloadFired,
         DocumentUnloadRegistered,
         DocumentUnloadFired,
         SVGLocatableNearestViewportElement,
         SVGLocatableFarthestViewportElement,
         IsIndexElement,
         HTMLHeadElementProfile,
         OverflowChangedEvent,
         SVGPointMatrixTransform,
@@ skipping 88 matching lines @@
 
     void updateMeasurements();
 
     OwnPtr<BitVector> m_countBits;
     BitVector m_CSSFeatureBits;
 };
 
 } // namespace WebCore
 
 #endif // UseCounter_h