Remove CSS_REGIONS compile flag from Blink.

Source/core/rendering/RenderObject.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2000 Dirk Mueller (mueller@kde.org)
  *           (C) 2004 Allan Sandfeld Jensen (kde@carewolf.com)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2011 Apple Inc. All rights reserved.
  * Copyright (C) 2009 Google Inc. All rights reserved.
  * Copyright (C) 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  *
  * This library is free software; you can redistribute it and/or
@@ skipping 151 matching lines @@
 
     if (element->hasTagName(rubyTag)) {
         if (style->display() == INLINE)
             return new (arena) RenderRubyAsInline(element);
         else if (style->display() == BLOCK)
             return new (arena) RenderRubyAsBlock(element);
     }
     // treat <rt> as ruby text ONLY if it still has its default treatment of block
     if (element->hasTagName(rtTag) && style->display() == BLOCK)
         return new (arena) RenderRubyText(element);
-    if (doc->cssRegionsEnabled() && style->isDisplayRegionType() && !style->regionThread().isEmpty() && doc->renderView())
+    if (RuntimeEnabledFeatures::cssRegionsEnabled() && style->isDisplayRegionType() && !style->regionThread().isEmpty() && doc->renderView())
         return new (arena) RenderRegion(element, 0);
     switch (style->display()) {
     case NONE:
         return 0;
     case INLINE:
         return new (arena) RenderInline(element);
     case BLOCK:
     case INLINE_BLOCK:
     case RUN_IN:
     case COMPACT:
@@ skipping 2994 matching lines @@
 {
     if (object1) {
         const WebCore::RenderObject* root = object1;
         while (root->parent())
             root = root->parent();
         root->showRenderTreeAndMark(object1, "*", object2, "-", 0);
     }
 }
 
 #endif