Don't include headers from the layout API from other headers needlessly.

third_party/WebKit/Source/core/layout/shapes/ShapeOutsideInfo.h

 /*
  * 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.
@@ skipping 12 matching lines @@
  * 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 ShapeOutsideInfo_h
 #define ShapeOutsideInfo_h
 
-#include "core/layout/api/LineLayoutBlockFlow.h"
 #include "core/layout/shapes/Shape.h"
 #include "core/style/ComputedStyle.h"
 #include "core/style/ShapeValue.h"
 #include "platform/geometry/FloatRect.h"
 #include "platform/geometry/LayoutSize.h"
 #include "wtf/PtrUtil.h"
 #include <memory>
 
 namespace blink {
 
 class LayoutBox;
+class LineLayoutBlockFlow;
 class FloatingObject;
 
 class ShapeOutsideDeltas final {
     DISALLOW_NEW();
 public:
     ShapeOutsideDeltas()
         : m_lineOverlapsShape(false)
         , m_isValid(false)
     {
     }
@@ skipping 86 matching lines @@
 
     const LayoutBox& m_layoutBox;
     mutable std::unique_ptr<Shape> m_shape;
     LayoutSize m_referenceBoxLogicalSize;
     ShapeOutsideDeltas m_shapeOutsideDeltas;
     mutable bool m_isComputingShape;
 };
 
 } // namespace blink
 #endif