[CSS Grid Layout] Rename grid placement properties

Source/core/rendering/style/StyleGridItemData.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 28 matching lines @@
 
 namespace WebCore {
 
 class StyleGridItemData : public RefCounted<StyleGridItemData> {
 public:
     static PassRefPtr<StyleGridItemData> create() { return adoptRef(new StyleGridItemData); }
     PassRefPtr<StyleGridItemData> copy() const { return adoptRef(new StyleGridItemData(*this)); }
 
     bool operator==(const StyleGridItemData& o) const
     {
-        return m_gridStart == o.m_gridStart && m_gridEnd == o.m_gridEnd
-            && m_gridBefore == o.m_gridBefore && m_gridAfter == o.m_gridAfter;
+        return m_gridColumnStart == o.m_gridColumnStart && m_gridColumnEnd == o.m_gridColumnEnd
+            && m_gridRowStart == o.m_gridRowStart && m_gridRowEnd == o.m_gridRowEnd;
     }
 
     bool operator!=(const StyleGridItemData& o) const
     {
         return !(*this == o);
     }
 
-    GridPosition m_gridStart;
-    GridPosition m_gridEnd;
-    GridPosition m_gridBefore;
-    GridPosition m_gridAfter;
+    GridPosition m_gridColumnStart;
+    GridPosition m_gridColumnEnd;
+    GridPosition m_gridRowStart;
+    GridPosition m_gridRowEnd;
 
 private:
     StyleGridItemData();
     StyleGridItemData(const StyleGridItemData&);
 };
 
 } // namespace WebCore
 
 #endif // StyleGridItemData_h