[heap] Remove unused IntrusiveMarking class.

src/heap/spaces.cc

 // Copyright 2011 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/bits.h"
 #include "src/base/platform/platform.h"
 #include "src/full-codegen/full-codegen.h"
 #include "src/heap/mark-compact.h"
@@ skipping 3122 matching lines @@
     }
   }
 }
 
 
 void Page::Print() {
   // Make a best-effort to print the objects in the page.
   PrintF("Page@%p in %s\n", this->address(),
          AllocationSpaceName(this->owner()->identity()));
   printf(" --------------------------------------\n");
-  HeapObjectIterator objects(this, heap()->GcSafeSizeOfOldObjectFunction());
+  HeapObjectIterator objects(this, nullptr);
   unsigned mark_size = 0;
   for (HeapObject* object = objects.Next(); object != NULL;
        object = objects.Next()) {
     bool is_marked = Marking::IsBlackOrGrey(Marking::MarkBitFrom(object));
     PrintF(" %c ", (is_marked ? '!' : ' '));  // Indent a little.
     if (is_marked) {
-      mark_size += heap()->GcSafeSizeOfOldObjectFunction()(object);
+      mark_size += object->Size();
     }
     object->ShortPrint();
     PrintF("\n");
   }
   printf(" --------------------------------------\n");
   printf(" Marked: %x, LiveCount: %x\n", mark_size, LiveBytes());
 }
 
 #endif  // DEBUG
 }  // namespace internal
 }  // namespace v8