Delete remaining masks dead code.

sky/engine/core/css/StylePropertySerializer.cpp

 /*
  * (C) 1999-2003 Lars Knoll (knoll@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2012 Apple Inc. All rights reserved.
  * Copyright (C) 2011 Research In Motion Limited. All rights reserved.
  * Copyright (C) 2013 Intel Corporation. All rights reserved.
  *
  * 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.
@@ skipping 464 matching lines @@
 
                 // BUG 49055: make sure the value was not reset in the layer check just above.
                 if (j < size - 1 && shorthand.properties()[j + 1] == CSSPropertyBackgroundRepeatY && value) {
                     RefPtr<CSSValue> yValue = nullptr;
                     RefPtr<CSSValue> nextValue = values[j + 1];
                     if (nextValue->isValueList())
                         yValue = toCSSValueList(nextValue.get())->item(i);
                     else
                         yValue = nextValue;
 
-                    // background-repeat-x(y) or mask-repeat-x(y) may be like this : "initial, repeat". We can omit the implicit initial values
+                    // background-repeat-x(y) may be like this : "initial, repeat". We can omit the implicit initial values
                     // before starting to compare their values.
                     if (value->isImplicitInitialValue() || yValue->isImplicitInitialValue())
                         continue;
 
                     // FIXME: At some point we need to fix this code to avoid returning an invalid shorthand,
                     // since some longhand combinations are not serializable into a single shorthand.
                     if (!value->isPrimitiveValue() || !yValue->isPrimitiveValue())
                         continue;
 
                     CSSValueID xId = toCSSPrimitiveValue(value.get())->getValueID();
@@ skipping 294 matching lines @@
             return false;
         if (!value->isInitialValue())
             isInitialValue = false;
         if (!value->isInheritedValue())
             isInheritedValue = false;
     }
     return isInitialValue || isInheritedValue;
 }
 
 }