Move rendering/RenderLayer* to layout/

Source/core/rendering/RenderFlexibleBox.cpp

Index: Source/core/rendering/RenderFlexibleBox.cpp
diff --git a/Source/core/rendering/RenderFlexibleBox.cpp b/Source/core/rendering/RenderFlexibleBox.cpp
index 7002e3c0ca102db7e6a756d5fca7a3a5a26899fe..83713e7b570a7f4c3849ff3b7756801ec8ea49ce 100644
--- a/Source/core/rendering/RenderFlexibleBox.cpp
+++ b/Source/core/rendering/RenderFlexibleBox.cpp
@@ -32,8 +32,8 @@
 #include "core/rendering/RenderFlexibleBox.h"
 
 #include "core/frame/UseCounter.h"
+#include "core/layout/Layer.h"
 #include "core/paint/BlockPainter.h"
-#include "core/rendering/RenderLayer.h"
 #include "core/rendering/RenderView.h"
 #include "core/rendering/TextAutosizer.h"
 #include "core/rendering/style/RenderStyle.h"
@@ -990,7 +990,7 @@ void RenderFlexibleBox::prepareChildForPositionedLayout(RenderBox& child, Layout
 {
     ASSERT(child.isOutOfFlowPositioned());
     child.containingBlock()->insertPositionedObject(&child);
-    RenderLayer* childLayer = child.layer();
+    Layer* childLayer = child.layer();
     LayoutUnit inlinePosition = isColumnFlow() ? crossAxisOffset : mainAxisOffset;
     if (layoutMode == FlipForRowReverse && style()->flexDirection() == FlowRowReverse)
         inlinePosition = mainAxisExtent() - mainAxisOffset;