Change a bool type to an enum type in constructor argument of SpaceSplitString.

Source/core/dom/ElementData.h

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
  * Copyright (C) 2014 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
@@ skipping 42 matching lines @@
     // Override GarbageCollectedFinalized's finalizeGarbageCollectedObject to
     // dispatch to the correct subclass destructor.
     void finalizeGarbageCollectedObject();
 #else
     // Override RefCounted's deref() to ensure operator delete is called on
     // the appropriate subclass type.
     void deref();
 #endif
 
     void clearClass() const { m_classNames.clear(); }
-    void setClass(const AtomicString& className, bool shouldFoldCase) const { m_classNames.set(className, shouldFoldCase); }
+    void setClass(const AtomicString& className, bool shouldFoldCase) const { m_classNames.set(className, shouldFoldCase ? ShouldFoldCase : ShouldNotFoldCase); }
     const SpaceSplitString& classNames() const { return m_classNames; }
 
     const AtomicString& idForStyleResolution() const { return m_idForStyleResolution; }
     void setIdForStyleResolution(const AtomicString& newId) const { m_idForStyleResolution = newId; }
 
     const StylePropertySet* inlineStyle() const { return m_inlineStyle.get(); }
 
     const StylePropertySet* presentationAttributeStyle() const;
 
     AttributeCollection attributes() const;
@@ skipping 145 matching lines @@
 }
 
 inline MutableAttributeCollection UniqueElementData::attributes()
 {
     return MutableAttributeCollection(m_attributeVector);
 }
 
 } // namespace blink
 
 #endif // ElementData_h