Remove BisonCSSParser references in comments

Source/core/css/CSSPrimitiveValue.cpp

 /*
  * (C) 1999-2003 Lars Knoll (knoll@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2012 Apple Inc. 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.
  *
  * This library is distributed in the hope that it will be useful,
@@ skipping 782 matching lines @@
     return getDoubleValue() * conversionToCanonicalUnitsScaleFactor(type);
 }
 
 double CSSPrimitiveValue::getDoubleValue() const
 {
     return m_primitiveUnitType != CSS_CALC ? m_value.num : m_value.calc->doubleValue();
 }
 
 CSSPrimitiveValue::UnitType CSSPrimitiveValue::canonicalUnitTypeForCategory(UnitCategory category)
 {
-    // The canonical unit type is chosen according to the way BisonCSSParser::validUnit() chooses the default unit
+    // The canonical unit type is chosen according to the way CSSPropertyParser::validUnit() chooses the default unit
     // in each category (based on unitflags).
     switch (category) {
     case UNumber:
         return CSS_NUMBER;
     case ULength:
         return CSS_PX;
     case UPercent:
         return CSS_UNKNOWN; // Cannot convert between numbers and percent.
     case UTime:
         return CSS_MS;
@@ skipping 410 matching lines @@
         visitor->trace(m_value.shape);
         break;
     default:
         break;
     }
 #endif
     CSSValue::traceAfterDispatch(visitor);
 }
 
 } // namespace blink