Revert "Background finalization."

runtime/vm/dart_api_state.cc

-// Copyright (c) 2016, the Dart project authors.  Please see the AUTHORS file
-// for details. All rights reserved. Use of this source code is governed by a
-// BSD-style license that can be found in the LICENSE file.
-
-#include "vm/dart_api_state.h"
-
-#include "platform/assert.h"
-#include "platform/utils.h"
-#include "vm/heap.h"
-#include "vm/isolate.h"
-#include "vm/lockers.h"
-#include "vm/thread.h"
-#include "vm/timeline.h"
-
-namespace dart {
-
-BackgroundFinalizer::BackgroundFinalizer(Isolate* isolate,
-                                         FinalizationQueue* queue) :
-    isolate_(isolate),
-    queue_(queue) {
-  MonitorLocker ml(isolate->heap()->finalization_tasks_lock());
-  isolate->heap()->set_finalization_tasks(
-      isolate->heap()->finalization_tasks() + 1);
-  ml.Notify();
-}
-
-
-void BackgroundFinalizer::Run() {
-  bool result = Thread::EnterIsolateAsHelper(isolate_,
-                                             Thread::kFinalizerTask,
-                                             true /* bypass_safepoint */);
-  ASSERT(result);
-
-  {
-    TIMELINE_FUNCTION_GC_DURATION(Thread::Current(),
-                                  "BackgroundFinalization");
-
-    for (intptr_t i = 0; i < queue_->length(); i++) {
-      FinalizablePersistentHandle* handle = (*queue_)[i];
-      FinalizablePersistentHandle::Finalize(isolate_, handle);
-    }
-    delete queue_;
-  }
-
-  // Exit isolate cleanly *before* notifying it, to avoid shutdown race.
-  Thread::ExitIsolateAsHelper();
-
-  {
-    Heap* heap = isolate_->heap();
-    MonitorLocker ml(heap->finalization_tasks_lock());
-    heap->set_finalization_tasks(heap->finalization_tasks() - 1);
-    ml.Notify();
-  }
-}
-
-}  // namespace dart