[CSS Grid Layout] Rename grid-definition-{columns|rows} to match the new syntax

Source/core/css/CSSProperty.cpp

 /**
  * (C) 1999-2003 Lars Knoll (knoll@kde.org)
  * Copyright (C) 2004, 2005, 2006 Apple Computer, Inc.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
  * This library is distributed in the hope that it will be useful,
@@ skipping 575 matching lines @@
     case CSSPropertyFlexShrink:
     case CSSPropertyFlexWrap:
     case CSSPropertyWebkitFontSizeDelta:
     case CSSPropertyGridArea:
     case CSSPropertyGridAutoColumns:
     case CSSPropertyGridAutoFlow:
     case CSSPropertyGridAutoRows:
     case CSSPropertyGridColumn:
     case CSSPropertyGridColumnEnd:
     case CSSPropertyGridColumnStart:
-    case CSSPropertyGridDefinitionColumns:
-    case CSSPropertyGridDefinitionRows:
+    case CSSPropertyGridTemplateColumns:
+    case CSSPropertyGridTemplateRows:
     case CSSPropertyGridRow:
     case CSSPropertyGridRowEnd:
     case CSSPropertyGridRowStart:
     case CSSPropertyGridTemplateAreas:
     case CSSPropertyJustifyContent:
     case CSSPropertyWebkitLineClamp:
     case CSSPropertyWebkitLogicalHeight:
     case CSSPropertyWebkitLogicalWidth:
     case CSSPropertyWebkitMarginAfter:
     case CSSPropertyWebkitMarginAfterCollapse:
@@ skipping 76 matching lines @@
         return false;
     case CSSPropertyInvalid:
         ASSERT_NOT_REACHED();
         return false;
     }
     ASSERT_NOT_REACHED();
     return false;
 }
 
 } // namespace WebCore