Oilpan: Remove a visitor parameter from isHeapObjectAlive

Source/platform/heap/InlinedGlobalMarkingVisitor.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef InlinedGlobalMarkingVisitor_h
 #define InlinedGlobalMarkingVisitor_h
 
 #include "platform/heap/MarkingVisitorImpl.h"
 
 namespace blink {
@@ skipping 11 matching lines @@
         ASSERT(visitor->isGlobalMarkingVisitor());
     }
 
     // Hack to unify interface to visitor->trace().
     // Without this hack, we need to use visitor.trace() for
     // trace(InlinedGlobalMarkingVisitor) and visitor->trace() for trace(Visitor*).
     InlinedGlobalMarkingVisitor* operator->() { return this; }
 
     using Impl::mark;
     using Impl::ensureMarked;
-    using Impl::isMarked;
     using Impl::registerDelayedMarkNoTracing;
     using Impl::registerWeakTable;
     using Impl::registerWeakMembers;
 #if ENABLE(ASSERT)
     using Impl::weakTableRegistered;
 #endif
 
     template<typename T>
     void mark(T* t)
     {
@@ skipping 36 matching lines @@
     Visitor* m_visitor;
 };
 
 inline void GarbageCollectedMixin::trace(InlinedGlobalMarkingVisitor)
 {
 }
 
 } // namespace blink
 
 #endif