[heap] Remove unused support for heap iterator size function.

src/heap/mark-compact.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/v8.h"
 
 #include "src/base/atomicops.h"
 #include "src/base/bits.h"
 #include "src/code-stubs.h"
 #include "src/compilation-cache.h"
@@ skipping 151 matching lines @@
         HeapObject* object = HeapObject::cast(*current);
         CHECK(!MarkCompactCollector::IsOnEvacuationCandidate(object));
       }
     }
   }
 };
 
 
 static void VerifyEvacuation(Page* page) {
   VerifyEvacuationVisitor visitor;
-  HeapObjectIterator iterator(page, NULL);
+  HeapObjectIterator iterator(page);
   for (HeapObject* heap_object = iterator.Next(); heap_object != NULL;
        heap_object = iterator.Next()) {
     // We skip free space objects.
     if (!heap_object->IsFiller()) {
       heap_object->Iterate(&visitor);
     }
   }
 }
 
 
@@ skipping 4592 matching lines @@
   SlotsBuffer* buffer = *buffer_address;
   while (buffer != NULL) {
     SlotsBuffer* next_buffer = buffer->next();
     DeallocateBuffer(buffer);
     buffer = next_buffer;
   }
   *buffer_address = NULL;
 }
 }  // namespace internal
 }  // namespace v8