Use FixedTypedArrayBase's body descriptor for static visiting

src/heap/objects-visiting.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_OBJECTS_VISITING_H_
 #define V8_OBJECTS_VISITING_H_
 
 #include "src/allocation.h"
 #include "src/heap/heap.h"
 #include "src/heap/spaces.h"
@@ skipping 250 matching lines @@
  private:
   INLINE(static int VisitByteArray(Map* map, HeapObject* object)) {
     return reinterpret_cast<ByteArray*>(object)->ByteArraySize();
   }
 
   INLINE(static int VisitFixedDoubleArray(Map* map, HeapObject* object)) {
     int length = reinterpret_cast<FixedDoubleArray*>(object)->length();
     return FixedDoubleArray::SizeFor(length);
   }
 
-  INLINE(static int VisitFixedTypedArray(Map* map, HeapObject* object)) {
-    return reinterpret_cast<FixedTypedArrayBase*>(object)->size();
-  }
-
   INLINE(static int VisitJSObject(Map* map, HeapObject* object)) {
     return JSObjectVisitor::Visit(map, object);
   }
 
   INLINE(static int VisitSeqOneByteString(Map* map, HeapObject* object)) {
     return SeqOneByteString::cast(object)
         ->SeqOneByteStringSize(map->instance_type());
   }
 
   INLINE(static int VisitSeqTwoByteString(Map* map, HeapObject* object)) {
@@ skipping 146 matching lines @@
 // the next element. Given the head of the list, this function removes dead
 // elements from the list and if requested records slots for next-element
 // pointers. The template parameter T is a WeakListVisitor that defines how to
 // access the next-element pointers.
 template <class T>
 Object* VisitWeakList(Heap* heap, Object* list, WeakObjectRetainer* retainer);
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_OBJECTS_VISITING_H_