[CSS Grid Layout] Introduce an explicit type for resolved grid positions

Source/core/rendering/style/GridPosition.h

 /*
  * Copyright (C) 2012 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 24 matching lines @@
 
 namespace WebCore {
 
 enum GridPositionType {
     AutoPosition,
     ExplicitPosition, // [ <integer> || <string> ]
     SpanPosition, // span && [ <integer> || <string> ]
     NamedGridAreaPosition // <ident>
 };
 
-enum GridPositionSide {
-    ColumnStartSide,
-    ColumnEndSide,
-    RowStartSide,
-    RowEndSide
-};
-
 class GridPosition {
 public:
     GridPosition()
         : m_type(AutoPosition)
         , m_integerPosition(0)
     {
     }
 
-    static size_t adjustGridPositionForAfterEndSide(size_t resolvedPosition)
-    {
-        return resolvedPosition ? resolvedPosition - 1 : 0;
-    }
-
-    static size_t adjustGridPositionForSide(size_t resolvedPosition, GridPositionSide side)
-    {
-        // An item finishing on the N-th line belongs to the N-1-th cell.
-        if (side == ColumnEndSide || side == RowEndSide)
-            return adjustGridPositionForAfterEndSide(resolvedPosition);
-
-        return resolvedPosition;
-    }
-
     bool isPositive() const { return integerPosition() > 0; }
 
     GridPositionType type() const { return m_type; }
     bool isAuto() const { return m_type == AutoPosition; }
     bool isSpan() const { return m_type == SpanPosition; }
     bool isNamedGridArea() const { return m_type == NamedGridAreaPosition; }
 
     void setExplicitPosition(int position, const String& namedGridLine)
     {
         m_type = ExplicitPosition;
@@ skipping 52 matching lines @@
     }
 private:
     GridPositionType m_type;
     int m_integerPosition;
     String m_namedGridLine;
 };
 
 } // namespace WebCore
 
 #endif // GridPosition_h