Oilpan: Remove a visitor parameter from isHeapObjectAlive

Source/platform/heap/MarkingVisitorImpl.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 MarkingVisitorImpl_h
 #define MarkingVisitorImpl_h
 
 #include "platform/heap/Heap.h"
 #include "platform/heap/ThreadState.h"
 #include "platform/heap/Visitor.h"
@@ skipping 64 matching lines @@
         Heap::registerWeakTable(const_cast<void*>(closure), iterationCallback, iterationDoneCallback);
     }
 
 #if ENABLE(ASSERT)
     inline bool weakTableRegistered(const void* closure)
     {
         return Heap::weakTableRegistered(closure);
     }
 #endif
 
-    inline bool isMarked(const void* objectPointer)
-    {
-        return HeapObjectHeader::fromPayload(objectPointer)->isMarked();
-    }
-
     inline bool ensureMarked(const void* objectPointer)
     {
         if (!objectPointer)
             return false;
         if (!toDerived()->shouldMarkObject(objectPointer))
             return false;
 #if ENABLE(ASSERT)
-        if (isMarked(objectPointer))
+        if (HeapObjectHeader::fromPayload(objectPointer)->isMarked())
             return false;
 
         toDerived()->markNoTracing(objectPointer);
 #else
         // Inline what the above markNoTracing() call expands to,
         // so as to make sure that we do get all the benefits.
         HeapObjectHeader* header = HeapObjectHeader::fromPayload(objectPointer);
         if (header->isMarked())
             return false;
         header->mark();
@@ skipping 15 matching lines @@
 private:
     static void markNoTracingCallback(Visitor* visitor, void* object)
     {
         visitor->markNoTracing(object);
     }
 };
 
 } // namespace blink
 
 #endif