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

src/heap/spaces-inl.h

 // 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.
 
 #ifndef V8_HEAP_SPACES_INL_H_
 #define V8_HEAP_SPACES_INL_H_
 
 #include "src/heap/spaces.h"
 #include "src/heap-profiler.h"
 #include "src/isolate.h"
@@ skipping 70 matching lines @@
 
 // -----------------------------------------------------------------------------
 // HeapObjectIterator
 HeapObject* HeapObjectIterator::FromCurrentPage() {
   while (cur_addr_ != cur_end_) {
     if (cur_addr_ == space_->top() && cur_addr_ != space_->limit()) {
       cur_addr_ = space_->limit();
       continue;
     }
     HeapObject* obj = HeapObject::FromAddress(cur_addr_);
-    int obj_size = (size_func_ == NULL) ? obj->Size() : size_func_(obj);
+    int obj_size = obj->Size();
     cur_addr_ += obj_size;
     DCHECK(cur_addr_ <= cur_end_);
     // TODO(hpayer): Remove the debugging code.
     if (cur_addr_ > cur_end_) {
       space_->heap()->isolate()->PushStackTraceAndDie(0xaaaaaaaa, obj, NULL,
                                                       obj_size);
     }
 
     if (!obj->IsFiller()) {
       DCHECK_OBJECT_SIZE(obj_size);
@@ skipping 312 matching lines @@
 
 
 intptr_t LargeObjectSpace::Available() {
   return ObjectSizeFor(heap()->isolate()->memory_allocator()->Available());
 }
 
 }
 }  // namespace v8::internal
 
 #endif  // V8_HEAP_SPACES_INL_H_