Remove support for device-width|height for @viewport rule according to spec change

Source/core/css/resolver/ViewportStyleResolver.cpp

 /*
  * Copyright (C) 2012 Intel Corporation. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * 1. Redistributions of source code must retain the above
  *    copyright notice, this list of conditions and the following
  *    disclaimer.
@@ skipping 126 matching lines @@
             return percentValue;
         default:
             ASSERT_NOT_REACHED();
             break;
         }
     }
 
     switch (primitiveValue->getValueID()) {
     case CSSValueAuto:
         return defaultValue;
-    case CSSValueDeviceHeight:
-        return ViewportArguments::ValueDeviceHeight;
-    case CSSValueDeviceWidth:
-        return ViewportArguments::ValueDeviceWidth;
     case CSSValueLandscape:
         return ViewportArguments::ValueLandscape;
     case CSSValuePortrait:
         return ViewportArguments::ValuePortrait;
     case CSSValueZoom:
         return defaultValue;
     case CSSValueFixed:
         return 0;
     default:
         return defaultValue;
     }
 }
 
 } // namespace WebCore