Remove FlowThreadController and relateds.

Source/core/rendering/RenderView.cpp

Index: Source/core/rendering/RenderView.cpp
diff --git a/Source/core/rendering/RenderView.cpp b/Source/core/rendering/RenderView.cpp
index 2f8862bfe37c18cc7a1d1f7a704895429ba060af..f1dd69171c271d229e9923c47799abe9cf683e28 100644
--- a/Source/core/rendering/RenderView.cpp
+++ b/Source/core/rendering/RenderView.cpp
@@ -29,7 +29,6 @@
 #include "core/page/Page.h"
 #include "core/paint/ViewPainter.h"
 #include "core/rendering/ColumnInfo.h"
-#include "core/rendering/FlowThreadController.h"
 #include "core/rendering/HitTestResult.h"
 #include "core/rendering/RenderFlowThread.h"
 #include "core/rendering/RenderGeometryMap.h"
@@ -832,36 +831,20 @@ void RenderView::setIsInWindow(bool isInWindow)
         m_compositor->setIsInWindow(isInWindow);
 }
 
-FlowThreadController* RenderView::flowThreadController()
-{
-    if (!m_flowThreadController)
-        m_flowThreadController = FlowThreadController::create();
-
-    return m_flowThreadController.get();
-}
-
 void RenderView::pushLayoutState(LayoutState& layoutState)
 {
-    if (m_flowThreadController) {
-        RenderFlowThread* currentFlowThread = m_flowThreadController->currentRenderFlowThread();
-        if (currentFlowThread)
-            currentFlowThread->pushFlowThreadLayoutState(layoutState.renderer());
-    }
+    if (RenderFlowThread* currentFlowThread = layoutState.flowThread())
+        currentFlowThread->pushFlowThreadLayoutState(layoutState.renderer());
     m_layoutState = &layoutState;
 }
 
 void RenderView::popLayoutState()
 {
     ASSERT(m_layoutState);
+    RenderFlowThread* currentFlowThread = m_layoutState->flowThread();

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

We could potentially combine the lines below:

if (RenderFlowThread* currentFlowThread = m_layoutState->flowThread())
    currentFlowThread->popFlowThreadLayoutState();
m_layoutState = m_layoutState->next();

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

That may be right, but never mind: I have another upcoming patch that kills all
this code. :)

     m_layoutState = m_layoutState->next();
-    if (!m_flowThreadController)
-        return;
-
-    RenderFlowThread* currentFlowThread = m_flowThreadController->currentRenderFlowThread();
-    if (!currentFlowThread)
-        return;
-
-    currentFlowThread->popFlowThreadLayoutState();
+    if (currentFlowThread)

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

Nit: /me prefers early returns

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

Ditto.

+        currentFlowThread->popFlowThreadLayoutState();
 }
 
 IntervalArena* RenderView::intervalArena()