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

Source/core/dom/RenderTreeBuilder.h

Index: Source/core/dom/RenderTreeBuilder.h
diff --git a/Source/core/dom/RenderTreeBuilder.h b/Source/core/dom/RenderTreeBuilder.h
index 5bcc8adb13adc4511484f50859c228b674c83dbd..3a98514224c236da5ecff5b1d71c0e2c006ce256 100644
--- a/Source/core/dom/RenderTreeBuilder.h
+++ b/Source/core/dom/RenderTreeBuilder.h
@@ -34,7 +34,6 @@
 namespace WebCore {
 
 class ContainerNode;
-class RenderNamedFlowThread;
 class RenderObject;
 class RenderStyle;
 
@@ -44,7 +43,6 @@ public:
         : m_node(node)
         , m_renderingParent(0)
         , m_style(style)
-        , m_parentFlowRenderer(0)
     {
         ASSERT(!node->renderer());
         ASSERT(node->needsAttach());
@@ -68,15 +66,10 @@ private:
     bool shouldCreateRenderer() const;
     RenderStyle& style() const;
 
-    bool shouldMoveToFlowThread() const;
-    void moveToFlowThreadIfNeeded();
-    bool elementInsideRegionNeedsRenderer();
-
     Node* m_node;
     ContainerNode* m_renderingParent;
     NodeRenderingTraversal::ParentDetails m_parentDetails;
     mutable RefPtr<RenderStyle> m_style;
-    RenderNamedFlowThread* m_parentFlowRenderer;
 };
 
 } // namespace WebCore