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

src/heap/heap.h

 // 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.
 
 #ifndef V8_HEAP_HEAP_H_
 #define V8_HEAP_HEAP_H_
 
 #include <cmath>
 #include <map>
 
@@ skipping 2487 matching lines @@
   int counter_;
 };
 
 
 // Space iterator for iterating over all spaces of the heap.
 // For each space an object iterator is provided. The deallocation of the
 // returned object iterators is handled by the space iterator.
 class SpaceIterator : public Malloced {
  public:
   explicit SpaceIterator(Heap* heap);
-  SpaceIterator(Heap* heap, HeapObjectCallback size_func);
   virtual ~SpaceIterator();
 
   bool has_next();
   ObjectIterator* next();
 
  private:
   ObjectIterator* CreateIterator();
 
   Heap* heap_;
   int current_space_;         // from enum AllocationSpace.
   ObjectIterator* iterator_;  // object iterator for the current space.
-  HeapObjectCallback size_func_;
 };
 
 
 // A HeapIterator provides iteration over the whole heap. It
 // aggregates the specific iterators for the different spaces as
 // these can only iterate over one space only.
 //
 // HeapIterator ensures there is no allocation during its lifetime
 // (using an embedded DisallowHeapAllocation instance).
 //
@@ skipping 255 matching lines @@
   DisallowHeapAllocation no_allocation;  // i.e. no gc allowed.
 
  private:
   DISALLOW_IMPLICIT_CONSTRUCTORS(PathTracer);
 };
 #endif  // DEBUG
 }
 }  // namespace v8::internal
 
 #endif  // V8_HEAP_HEAP_H_