[oilpan] Rename visit to mark.

Source/wtf/HashTraits.h

Index: Source/wtf/HashTraits.h
diff --git a/Source/wtf/HashTraits.h b/Source/wtf/HashTraits.h
index 234969da3b90db0d614be398a6ea0d316ecf5dbe..e3924bcd101955c7e7397e7ac2fbaee029c173bd 100644
--- a/Source/wtf/HashTraits.h
+++ b/Source/wtf/HashTraits.h
@@ -54,9 +54,7 @@ namespace WTF {
         // a hash table will have at least N entries.
         static const int minimumTableSize = 8;
 
-        // By default, nothing needs to be done with the keys and values when
-        // visiting the hash table.
-        static const bool needsVisiting = NeedsVisiting<T>::value;
+        static const bool needsTracing = NeedsTracing<T>::value;
         static const bool isWeak = IsWeak<T>::value;
     };
 
@@ -250,7 +248,7 @@ namespace WTF {
         static EmptyValueType emptyValue() { return KeyValuePair<typename KeyTraits::EmptyValueType, typename ValueTraits::EmptyValueType>(KeyTraits::emptyValue(), ValueTraits::emptyValue()); }
 
         static const bool needsDestruction = KeyTraits::needsDestruction || ValueTraits::needsDestruction;
-        static const bool needsVisiting = KeyTraits::needsVisiting || ValueTraits::needsVisiting;
+        static const bool needsTracing = KeyTraits::needsTracing || ValueTraits::needsTracing;
         static const bool isWeak = KeyTraits::isWeak || ValueTraits::isWeak;
 
         static const int minimumTableSize = KeyTraits::minimumTableSize;