CSS Properties and Values API: Use initial value where appropriate for var()

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

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CSSSyntaxDescriptor_h
 #define CSSSyntaxDescriptor_h
 
 #include "core/css/parser/CSSParserTokenRange.h"
 
 namespace blink {
@@ skipping 29 matching lines @@
     CSSSyntaxType m_type;
     String m_string; // Only used when m_type is CSSSyntaxType::Ident
     bool m_repeatable;
 };
 
 class CSSSyntaxDescriptor {
 public:
     CSSSyntaxDescriptor(String syntax);
 
     const CSSValue* parse(CSSParserTokenRange) const;
-    const CSSValue* parse(const String&) const;
     bool isValid() const { return !m_syntaxComponents.isEmpty(); }
     bool isTokenStream() const { return m_syntaxComponents.size() == 1 && m_syntaxComponents[0].m_type == CSSSyntaxType::TokenStream; }
 
 private:
     Vector<CSSSyntaxComponent> m_syntaxComponents;
 };
 
 } // namespace blink
 
 #endif // CSSSyntaxDescriptor_h