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

src/heap/store-buffer.cc

Index: src/heap/store-buffer.cc
diff --git a/src/heap/store-buffer.cc b/src/heap/store-buffer.cc
index a1968442541d166f33281e62644d1272d806200c..e6430d5a2ab3b7156234dd3673b61e6fcff6fc78 100644
--- a/src/heap/store-buffer.cc
+++ b/src/heap/store-buffer.cc
@@ -455,7 +455,7 @@ void StoreBuffer::IteratePointersToNewSpace(ObjectSlotCallback slot_callback) {
           PagedSpace* owner = reinterpret_cast<PagedSpace*>(page->owner());
           if (owner == heap_->map_space()) {
             DCHECK(page->WasSwept());
-            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.
@@ -470,7 +470,7 @@ void StoreBuffer::IteratePointersToNewSpace(ObjectSlotCallback slot_callback) {
           } else {
             heap_->mark_compact_collector()->SweepOrWaitUntilSweepingCompleted(
                 page);
-            HeapObjectIterator iterator(page, NULL);
+            HeapObjectIterator iterator(page);
             for (HeapObject* heap_object = iterator.Next(); heap_object != NULL;
                  heap_object = iterator.Next()) {
               // We iterate over objects that contain new space pointers only.