Rename 'instant' value of scroll-behavior CSS property to 'auto'

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 4736 matching lines @@
     }
     ASSERT_NOT_REACHED();
     return OverflowAlignmentTrue;
 }
 
 template<> inline CSSPrimitiveValue::CSSPrimitiveValue(ScrollBehavior behavior)
     : CSSValue(PrimitiveClass)
 {
     m_primitiveUnitType = CSS_VALUE_ID;
     switch (behavior) {
-    case ScrollBehaviorInstant:
-        m_value.valueID = CSSValueInstant;
+    case ScrollBehaviorAuto:
+        m_value.valueID = CSSValueAuto;
         break;
     case ScrollBehaviorSmooth:
         m_value.valueID = CSSValueSmooth;
         break;
-    case ScrollBehaviorAuto:
-        // Behavior 'auto' is only allowed in ScrollOptions arguments passed to
+    case ScrollBehaviorInstant:
+        // Behavior 'instant' is only allowed in ScrollOptions arguments passed to
         // CSSOM scroll APIs.
         ASSERT_NOT_REACHED();
     }
 }
 
 template<> inline CSSPrimitiveValue::operator ScrollBehavior() const
 {
     switch (getValueID()) {
-    case CSSValueInstant:
-        return ScrollBehaviorInstant;
+    case CSSValueAuto:
+        return ScrollBehaviorAuto;
     case CSSValueSmooth:
         return ScrollBehaviorSmooth;
     default:
         break;
     }
     ASSERT_NOT_REACHED();
-    return ScrollBehaviorInstant;
+    return ScrollBehaviorAuto;
 }
 
 }
 
 #endif