Remove FlowThreadController and relateds.

Source/core/rendering/LayoutState.h

Index: Source/core/rendering/LayoutState.h
diff --git a/Source/core/rendering/LayoutState.h b/Source/core/rendering/LayoutState.h
index 1cbdc5d7a42bbce390642d6c0a011e419e18a7da..f64820e7ba74fdb4f1d827cfe0ed9d80c38e0162 100644
--- a/Source/core/rendering/LayoutState.h
+++ b/Source/core/rendering/LayoutState.h
@@ -35,6 +35,7 @@ namespace blink {
 
 class ForceHorriblySlowRectMapping;
 class RenderBox;
+class RenderFlowThread;
 class RenderObject;
 class RenderView;
 
@@ -72,6 +73,8 @@ public:
 
     bool needsBlockDirectionLocationSetBeforeLayout() const { return m_isPaginated && m_pageLogicalHeight; }
 
+    RenderFlowThread* flowThread() const { return m_flowThread; }
+
     ColumnInfo* columnInfo() const { return m_columnInfo; }
 
     RenderObject& renderer() const { return m_renderer; }
@@ -85,6 +88,8 @@ private:
     bool m_pageLogicalHeightChanged : 1;
     bool m_containingBlockLogicalWidthChanged : 1;
 
+    RenderFlowThread* m_flowThread;

[Julien - ping for review, 2014/12/02 16:59:47]

Maybe we should add the field to PaintInvalidationState too as we need to know
the flow thread to generate paint invalidations. This is a separate patch
though.

[mstensho (USE GERRIT), 2014/12/02 19:41:11]

Do you have a bug report on that? I think paint invalidations generally work
fine already.

+
     // If the enclosing pagination model is a column model, then this will store column information for easy retrieval/manipulation.
     ColumnInfo* m_columnInfo;
     LayoutState* m_next;