Remove FlowThreadController and relateds.

Source/core/rendering/FlowThreadController.h

Index: Source/core/rendering/FlowThreadController.h
diff --git a/Source/core/rendering/FlowThreadController.h b/Source/core/rendering/FlowThreadController.h
deleted file mode 100644
index 69d1d0576991436fe563bfd324b9bbcdb721a4e1..0000000000000000000000000000000000000000
--- a/Source/core/rendering/FlowThreadController.h
+++ /dev/null
@@ -1,57 +0,0 @@
-/*
- * Copyright (C) 2012 Adobe Systems Incorporated. All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- *
- * 1. Redistributions of source code must retain the above
- *    copyright notice, this list of conditions and the following
- *    disclaimer.
- * 2. Redistributions in binary form must reproduce the above
- *    copyright notice, this list of conditions and the following
- *    disclaimer in the documentation and/or other materials
- *    provided with the distribution.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER "AS IS" AND ANY
- * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
- * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER BE
- * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
- * OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
- * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
- * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
- * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
- * TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
- * THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- */
-
-#ifndef FlowThreadController_h
-#define FlowThreadController_h
-
-#include "wtf/FastAllocBase.h"
-#include "wtf/PassOwnPtr.h"
-
-namespace blink {
-
-class RenderFlowThread;
-
-class FlowThreadController {
-    WTF_MAKE_FAST_ALLOCATED;
-public:
-    static PassOwnPtr<FlowThreadController> create();
-
-    RenderFlowThread* currentRenderFlowThread() const { return m_currentRenderFlowThread; }
-    void setCurrentRenderFlowThread(RenderFlowThread* flowThread) { m_currentRenderFlowThread = flowThread; }
-
-protected:
-    FlowThreadController();
-
-private:
-    RenderFlowThread* m_currentRenderFlowThread;
-};
-
-}
-
-#endif