Avoid unnecessary float<->LayoutUnit conversions in RenderVTTCue

Source/core/rendering/RenderVTTCue.h

 /*
  * Copyright (C) 2012 Victor Carbune (victor@rosedu.org)
  *
  * 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 APPLE COMPUTER, INC. ``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 APPLE COMPUTER, INC. OR
  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
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 #ifndef RenderVTTCue_h
 #define RenderVTTCue_h
 
 #include "core/rendering/RenderBlockFlow.h"
-#include "core/rendering/RenderInline.h"
-#include "platform/geometry/FloatPoint.h"
 #include "platform/heap/Handle.h"
 
 namespace blink {
 
 class VTTCue;
 class VTTCueBox;
 
 class RenderVTTCue final : public RenderBlockFlow {
 public:
     explicit RenderVTTCue(VTTCueBox*);
 
     virtual void trace(Visitor*) override;
 private:
     virtual void layout() override;
 
     bool isOutside() const;
     bool isOverlapping() const;
     bool shouldSwitchDirection(InlineFlowBox*, LayoutUnit) const;
 
     void moveBoxesByStep(LayoutUnit);
     bool switchDirection(bool&, LayoutUnit&);
 
     bool findFirstLineBox(InlineFlowBox*&);
     bool initializeLayoutParameters(InlineFlowBox*, LayoutUnit&, LayoutUnit&);
     void placeBoxInDefaultPosition(LayoutUnit, bool&);
     void repositionCueSnapToLinesSet();
     void repositionCueSnapToLinesNotSet();
 
     RawPtrWillBeMember<VTTCue> m_cue;
-    FloatPoint m_fallbackPosition;
+    LayoutPoint m_defaultPosition;
 };
 
 } // namespace blink
 
 #endif // RenderVTTCue_h