Remove 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 {
 
 intptr_t ApiNativeScope::current_memory_usage_ = 0;
 
-BackgroundFinalizer::BackgroundFinalizer(Isolate* isolate,
-                                         FinalizationQueue* queue)
-    : isolate_(isolate), queue_(queue) {
-  ASSERT(FLAG_background_finalization);
-  PageSpace* old_space = isolate->heap()->old_space();
-  MonitorLocker ml(old_space->tasks_lock());
-  old_space->set_tasks(old_space->tasks() + 1);
-}
-
-
-void BackgroundFinalizer::Run() {
-  bool result = Thread::EnterIsolateAsHelper(isolate_, Thread::kFinalizerTask);
-  ASSERT(result);
-
-  {
-    Thread* thread = Thread::Current();
-    TIMELINE_FUNCTION_GC_DURATION(thread, "BackgroundFinalization");
-    TransitionVMToNative transition(thread);
-    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();
-
-  {
-    PageSpace* old_space = isolate_->heap()->old_space();
-    MonitorLocker ml(old_space->tasks_lock());
-    old_space->set_tasks(old_space->tasks() - 1);
-    ml.NotifyAll();
-  }
-}
-
 }  // namespace dart