InlinedVisitor: Migrate xml to use inlined tracing

Source/core/xml/XPathPredicate.cpp

Index: Source/core/xml/XPathPredicate.cpp
diff --git a/Source/core/xml/XPathPredicate.cpp b/Source/core/xml/XPathPredicate.cpp
index a0b3b668ab979f1d131ba4636ee5027c9f8f7d2b..51804ce19fb856a84afbe9fddfeac928711fb780 100644
--- a/Source/core/xml/XPathPredicate.cpp
+++ b/Source/core/xml/XPathPredicate.cpp
@@ -42,7 +42,7 @@ Number::Number(double value)
 {
 }
 
-void Number::trace(Visitor* visitor)
+DEFINE_TRACE(Number)
 {
     visitor->trace(m_value);
     Expression::trace(visitor);
@@ -58,7 +58,7 @@ StringExpression::StringExpression(const String& value)
 {
 }
 
-void StringExpression::trace(Visitor* visitor)
+DEFINE_TRACE(StringExpression)
 {
     visitor->trace(m_value);
     Expression::trace(visitor);
@@ -281,7 +281,7 @@ Predicate::Predicate(PassOwnPtrWillBeRawPtr<Expression> expr)
 
 DEFINE_EMPTY_DESTRUCTOR_WILL_BE_REMOVED(Predicate);
 
-void Predicate::trace(Visitor* visitor)
+DEFINE_TRACE(Predicate)
 {
     visitor->trace(m_expr);
 }