Remove CSS regions support, keeping a bare minimum to support "region-based" multicol.

Source/core/css/RuntimeCSSEnabled.cpp

 /*
  * Copyright (C) 2013 Adobe Systems Incorporated. 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.
@@ skipping 27 matching lines @@
 typedef Vector<bool> BoolVector;
 
 static void setCSSPropertiesEnabled(CSSPropertyID* properties, size_t length, bool featureFlag)
 {
     for (size_t i = 0; i < length; i++)
         RuntimeCSSEnabled::setCSSPropertyEnabled(properties[i], featureFlag);
 }
 
 static void setPropertySwitchesFromRuntimeFeatures()
 {
-    CSSPropertyID regionProperites[] = {
-        CSSPropertyWebkitFlowInto,
-        CSSPropertyWebkitFlowFrom,
-        CSSPropertyWebkitRegionFragment,
-        CSSPropertyWebkitRegionBreakAfter,
-        CSSPropertyWebkitRegionBreakBefore,
-        CSSPropertyWebkitRegionBreakInside
-    };
-    setCSSPropertiesEnabled(regionProperites, WTF_ARRAY_LENGTH(regionProperites), RuntimeEnabledFeatures::cssRegionsEnabled());
     CSSPropertyID exclusionProperties[] = {
         CSSPropertyWebkitWrapFlow,
         CSSPropertyWebkitWrapThrough,
     };
     setCSSPropertiesEnabled(exclusionProperties, WTF_ARRAY_LENGTH(exclusionProperties), RuntimeEnabledFeatures::cssExclusionsEnabled());
     CSSPropertyID shapeProperties[] = {
         CSSPropertyShapeMargin,
         CSSPropertyShapePadding,
         CSSPropertyShapeImageThreshold,
         CSSPropertyShapeInside,
@@ skipping 98 matching lines @@
 void RuntimeCSSEnabled::filterEnabledCSSPropertiesIntoVector(const CSSPropertyID* properties, size_t propertyCount, Vector<CSSPropertyID>& outVector)
 {
     for (unsigned i = 0; i < propertyCount; i++) {
         CSSPropertyID property = properties[i];
         if (RuntimeCSSEnabled::isCSSPropertyEnabled(property))
             outVector.append(property);
     }
 }
 
 } // namespace WebCore