[CSS Grid Layout] Update grid-auto-flow to the new syntax

Source/core/css/CSSPrimitiveValueMappings.h

 /*
  * Copyright (C) 2007 Alexey Proskuryakov <ap@nypop.com>.
  * Copyright (C) 2008, 2009, 2010, 2011 Apple Inc. All rights reserved.
  * Copyright (C) 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  * Copyright (C) 2009 Jeff Schiller <codedread@gmail.com>
  * Copyright (C) Research In Motion Limited 2010. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
@@ skipping 4063 matching lines @@
     case CSSValuePreserve3d:
         return TransformStyle3DPreserve3D;
     default:
         break;
     }
 
     ASSERT_NOT_REACHED();
     return TransformStyle3DFlat;
 }
 
-template<> inline CSSPrimitiveValue::operator GridAutoFlow() const
-{
-    ASSERT(isValueID());
-    switch (m_value.valueID) {
-    case CSSValueNone:
-        return AutoFlowNone;
-    case CSSValueColumn:
-        return AutoFlowColumn;
-    case CSSValueRow:
-        return AutoFlowRow;
-    default:
-        break;
-    }
-
-    ASSERT_NOT_REACHED();
-    return AutoFlowNone;
-
-}
-
-template<> inline CSSPrimitiveValue::CSSPrimitiveValue(GridAutoFlow flow)
-    : CSSValue(PrimitiveClass)
-{
-    m_primitiveUnitType = CSS_VALUE_ID;
-    switch (flow) {
-    case AutoFlowNone:
-        m_value.valueID = CSSValueNone;
-        break;
-    case AutoFlowColumn:
-        m_value.valueID = CSSValueColumn;
-        break;
-    case AutoFlowRow:
-        m_value.valueID = CSSValueRow;
-        break;
-    }
-}
-
 enum LengthConversion {
     AnyConversion = ~0,
     FixedConversion = 1 << 0,
     AutoConversion = 1 << 1,
     PercentConversion = 1 << 2,
 };
 
 template<int supported> Length CSSPrimitiveValue::convertToLength(const CSSToLengthConversionData& conversionData)
 {
     if ((supported & FixedConversion) && isLength())
@@ skipping 676 matching lines @@
     default:
         break;
     }
     ASSERT_NOT_REACHED();
     return ScrollBehaviorInstant;
 }
 
 }
 
 #endif