Remove backface visibility

sky/engine/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 249 matching lines @@
     case CSSValuePlusLighter:
         return CompositePlusLighter;
     default:
         break;
     }
 
     ASSERT_NOT_REACHED();
     return CompositeClear;
 }
 
-template<> inline CSSPrimitiveValue::CSSPrimitiveValue(EBackfaceVisibility e)
-    : CSSValue(PrimitiveClass)
-{
-    m_primitiveUnitType = CSS_VALUE_ID;
-    switch (e) {
-    case BackfaceVisibilityVisible:
-        m_value.valueID = CSSValueVisible;
-        break;
-    case BackfaceVisibilityHidden:
-        m_value.valueID = CSSValueHidden;
-        break;
-    }
-}
-
-template<> inline CSSPrimitiveValue::operator EBackfaceVisibility() const
-{
-    ASSERT(isValueID());
-    switch (m_value.valueID) {
-    case CSSValueVisible:
-        return BackfaceVisibilityVisible;
-    case CSSValueHidden:
-        return BackfaceVisibilityHidden;
-    default:
-        break;
-    }
-
-    ASSERT_NOT_REACHED();
-    return BackfaceVisibilityHidden;
-}
-
-
 template<> inline CSSPrimitiveValue::CSSPrimitiveValue(EFillAttachment e)
     : CSSValue(PrimitiveClass)
 {
     m_primitiveUnitType = CSS_VALUE_ID;
     switch (e) {
     case LocalBackgroundAttachment:
         m_value.valueID = CSSValueLocal;
         break;
     case FixedBackgroundAttachment:
         m_value.valueID = CSSValueFixed;
@@ skipping 2456 matching lines @@
     default:
         break;
     }
     ASSERT_NOT_REACHED();
     return OverflowAlignmentTrue;
 }
 
 }
 
 #endif  // SKY_ENGINE_CORE_CSS_CSSPRIMITIVEVALUEMAPPINGS_H_