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

Source/core/rendering/RenderImage.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2000 Dirk Mueller (mueller@kde.org)
  *           (C) 2006 Allan Sandfeld Jensen (kde@carewolf.com)
  *           (C) 2006 Samuel Weinig (sam.weinig@gmail.com)
  * Copyright (C) 2003, 2004, 2005, 2006, 2008, 2009, 2010, 2011 Apple Inc. All rights reserved.
  * Copyright (C) 2010 Google Inc. All rights reserved.
  * Copyright (C) Research In Motion Limited 2011-2012. All rights reserved.
  *
@@ skipping 204 matching lines @@
         return;
 
     bool shouldRepaint = true;
     if (intrinsicSizeChanged) {
         if (!preferredLogicalWidthsDirty())
             setPreferredLogicalWidthsDirty();
 
         bool hasOverrideSize = hasOverrideHeight() || hasOverrideWidth();
         if (!hasOverrideSize && !imageSizeChanged) {
             LogicalExtentComputedValues computedValues;
-            computeLogicalWidthInRegion(computedValues);
+            computeLogicalWidth(computedValues);
             LayoutUnit newWidth = computedValues.m_extent;
             computeLogicalHeight(height(), 0, computedValues);
             LayoutUnit newHeight = computedValues.m_extent;
 
             imageSizeChanged = width() != newWidth || height() != newHeight;
         }
 
         // FIXME: We only need to recompute the containing block's preferred size
         // if the containing block's size depends on the image's size (i.e., the container uses shrink-to-fit sizing).
         // There's no easy way to detect that shrink-to-fit is needed, always force a layout.
@@ skipping 394 matching lines @@
         return 0;
 
     ImageResource* cachedImage = m_imageResource->cachedImage();
     if (cachedImage && cachedImage->image() && cachedImage->image()->isSVGImage())
         return toSVGImage(cachedImage->image())->embeddedContentBox();
 
     return 0;
 }
 
 } // namespace WebCore