SnapCoordinator.h doesn't need to include LayoutBox.h

third_party/WebKit/Source/core/page/scrolling/SnapCoordinator.h

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef SnapCoordinator_h
 #define SnapCoordinator_h
 
-#include "core/layout/LayoutBox.h"
+#include "core/CoreExport.h"
+#include "core/css/CSSPrimitiveValueMappings.h"
 #include "platform/heap/Handle.h"
 #include "wtf/Vector.h"
 
 namespace blink {
 
 class ComputedStyle;
+class ContainerNode;
 class Element;
+class LayoutBox;
 struct LengthPoint;
 
 // Snap Coordinator keeps track of snap containers and all of their associated
 // snap areas. It also contains the logic to generate the list of valid snap
 // positions for a given snap container.
 //
 // Snap container:
 //   An scroll container that has 'scroll-snap-type' value other
 //   than 'none'.
 // Snap area:
@@ skipping 23 matching lines @@
     explicit SnapCoordinator();
 
     Vector<double> snapOffsets(const ContainerNode&, ScrollbarOrientation);
 
     HashSet<const LayoutBox*> m_snapContainers;
 };
 
 } // namespace blink
 
 #endif // SnapCoordinator_h