Reland of moving duplicate functions and symbol names in core/css

third_party/WebKit/Source/core/css/CSSPrimitiveValue.h

 /*
  * (C) 1999-2003 Lars Knoll (knoll@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2008 Apple Inc. All rights reserved.
  * Copyright (C) 2007 Alexey Proskuryakov <ap@webkit.org>
  *
  * 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 303 matching lines @@
     // FIXME: oilpan: Should be a member, but no support for members in unions.
     // Just trace the raw ptr for now.
     CSSCalcValue* calc;
   } m_value;
 };
 
 using CSSLengthArray = CSSPrimitiveValue::CSSLengthArray;
 
 DEFINE_CSS_VALUE_TYPE_CASTS(CSSPrimitiveValue, isPrimitiveValue());
 
+template <>
+int CSSPrimitiveValue::computeLength(const CSSToLengthConversionData&) const;
+
+template <>
+Length CSSPrimitiveValue::computeLength(const CSSToLengthConversionData&) const;
+
+template <>
+unsigned CSSPrimitiveValue::computeLength(
+    const CSSToLengthConversionData&) const;
+
+template <>
+short CSSPrimitiveValue::computeLength(const CSSToLengthConversionData&) const;
+
+template <>
+float CSSPrimitiveValue::computeLength(const CSSToLengthConversionData&) const;
+
+template <>
+double CSSPrimitiveValue::computeLength(const CSSToLengthConversionData&) const;
 }  // namespace blink
 
 #endif  // CSSPrimitiveValue_h