[heap] Remove dead write write barrier counter code

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/heap/spaces.h"
 
 #include <utility>
 
 #include "src/base/bits.h"
 #include "src/base/platform/platform.h"
@@ skipping 495 matching lines @@
   chunk->area_start_ = area_start;
   chunk->area_end_ = area_end;
   chunk->flags_ = Flags(NO_FLAGS);
   chunk->set_owner(owner);
   chunk->InitializeReservedMemory();
   chunk->old_to_new_slots_.SetValue(nullptr);
   chunk->old_to_old_slots_ = nullptr;
   chunk->typed_old_to_new_slots_.SetValue(nullptr);
   chunk->typed_old_to_old_slots_ = nullptr;
   chunk->skip_list_ = nullptr;
-  chunk->write_barrier_counter_ = kWriteBarrierCounterGranularity;
   chunk->progress_bar_ = 0;
   chunk->high_water_mark_.SetValue(static_cast<intptr_t>(area_start - base));
   chunk->concurrent_sweeping_state().SetValue(kSweepingDone);
   chunk->mutex_ = new base::Mutex();
   chunk->available_in_free_list_ = 0;
   chunk->wasted_memory_ = 0;
   chunk->ResetLiveBytes();
   chunk->ClearLiveness();
   chunk->set_next_chunk(nullptr);
   chunk->set_prev_chunk(nullptr);
@@ skipping 2708 matching lines @@
     object->ShortPrint();
     PrintF("\n");
   }
   printf(" --------------------------------------\n");
   printf(" Marked: %x, LiveCount: %x\n", mark_size, LiveBytes());
 }
 
 #endif  // DEBUG
 }  // namespace internal
 }  // namespace v8