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

Source/core/dom/ClassCollection.cpp

Index: Source/core/dom/ClassCollection.cpp
diff --git a/Source/core/dom/ClassCollection.cpp b/Source/core/dom/ClassCollection.cpp
index 53534a1d7b14c83a4e72a11d2c778e68e6b1253b..051af1f11549fdd46562fa09105321d19729eff1 100644
--- a/Source/core/dom/ClassCollection.cpp
+++ b/Source/core/dom/ClassCollection.cpp
@@ -37,7 +37,7 @@ namespace blink {
 
 ClassCollection::ClassCollection(ContainerNode& rootNode, const AtomicString& classNames)
     : HTMLCollection(rootNode, ClassCollectionType, DoesNotOverrideItemAfter)
-    , m_classNames(classNames, document().inQuirksMode())
+    , m_classNames(classNames, document().inQuirksMode() ? SpaceSplitString::ShouldFoldCase : SpaceSplitString::ShouldNotFoldCase)
     , m_originalClassNames(classNames)
 {
 }