Oilpan: fix build after r193185.

Source/platform/heap/Visitor.h

 /*
  * Copyright (C) 2013 Google 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.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 760 matching lines @@
             // in release builds.
             //
             // ASan adds extra stack usage, so disable the assert when it is
             // enabled so as to avoid testing against a much lower & too low,
             // stack depth threshold.
             //
             // FIXME: visitor->isMarked(t) exception is to allow empty trace()
             // calls from HashTable weak processing. Remove the condition once
             // it is refactored.
 #if !defined(ADDRESS_SANITIZER)
-            ASSERT(visitor->canTraceEagerly() || visitor->isMarked(t));
+            ASSERT(Visitor::canTraceEagerly() || visitor->isMarked(t));
 #endif
             if (LIKELY(Visitor::canTraceEagerly())) {
                 if (visitor->ensureMarked(t)) {
                     TraceTrait<T>::trace(visitor, const_cast<T*>(t));
                 }
                 return;
             }
         }
         visitor->mark(const_cast<T*>(t), &TraceTrait<T>::trace);
     }
@@ skipping 257 matching lines @@
     {
         DEFINE_STATIC_LOCAL(String, typenameString, (WTF::extractTypeNameFromFunctionName(WTF::extractNameFunction<T>())));
         return typenameString;
     }
 };
 #endif
 
 } // namespace blink
 
 #endif // Visitor_h