chore: remove unused class `electron::ObjectLifeMonitor` (#43089)

* chore: remove unused electron::ObjectLifeMonitor

The last users were removed in June 2020 e1e73fa5f (#24115)
and May 2020 9d7ba982 (#23592).

* fixup! chore: remove unused electron::ObjectLifeMonitor

fix: oops

filenames.gni

@@ -562,8 +562,6 @@ filenames = {
     "shell/common/api/electron_bindings.cc",
     "shell/common/api/electron_bindings.h",
     "shell/common/api/features.cc",
-    "shell/common/api/object_life_monitor.cc",
-    "shell/common/api/object_life_monitor.h",
     "shell/common/application_info.cc",
     "shell/common/application_info.h",
     "shell/common/asar/archive.cc",

shell/common/api/object_life_monitor.cc

@@ -1,40 +0,0 @@
-// Copyright (c) 2013 GitHub, Inc.
-// Copyright (c) 2012 Intel Corp. All rights reserved.
-// Use of this source code is governed by the MIT license that can be
-// found in the LICENSE file.
-
-#include "shell/common/api/object_life_monitor.h"
-
-#include "base/functional/bind.h"
-
-namespace electron {
-
-ObjectLifeMonitor::ObjectLifeMonitor(v8::Isolate* isolate,
-                                     v8::Local<v8::Object> target)
-    : target_(isolate, target) {
-  target_.SetWeak(this, OnObjectGC, v8::WeakCallbackType::kParameter);
-}
-
-ObjectLifeMonitor::~ObjectLifeMonitor() {
-  if (target_.IsEmpty())
-    return;
-  target_.ClearWeak();
-  target_.Reset();
-}
-
-// static
-void ObjectLifeMonitor::OnObjectGC(
-    const v8::WeakCallbackInfo<ObjectLifeMonitor>& data) {
-  ObjectLifeMonitor* self = data.GetParameter();
-  self->target_.Reset();
-  self->RunDestructor();
-  data.SetSecondPassCallback(Free);
-}
-
-// static
-void ObjectLifeMonitor::Free(
-    const v8::WeakCallbackInfo<ObjectLifeMonitor>& data) {
-  delete data.GetParameter();
-}
-
-}  // namespace electron

shell/common/api/object_life_monitor.h

@@ -1,37 +0,0 @@
-// Copyright (c) 2013 GitHub, Inc.
-// Use of this source code is governed by the MIT license that can be
-// found in the LICENSE file.
-
-#ifndef ELECTRON_SHELL_COMMON_API_OBJECT_LIFE_MONITOR_H_
-#define ELECTRON_SHELL_COMMON_API_OBJECT_LIFE_MONITOR_H_
-
-#include "base/memory/weak_ptr.h"
-#include "v8/include/v8-object.h"
-#include "v8/include/v8-persistent-handle.h"
-#include "v8/include/v8-weak-callback-info.h"
-
-namespace electron {
-
-class ObjectLifeMonitor {
- protected:
-  ObjectLifeMonitor(v8::Isolate* isolate, v8::Local<v8::Object> target);
-  virtual ~ObjectLifeMonitor();
-
-  // disable copy
-  ObjectLifeMonitor(const ObjectLifeMonitor&) = delete;
-  ObjectLifeMonitor& operator=(const ObjectLifeMonitor&) = delete;
-
-  virtual void RunDestructor() = 0;
-
- private:
-  static void OnObjectGC(const v8::WeakCallbackInfo<ObjectLifeMonitor>& data);
-  static void Free(const v8::WeakCallbackInfo<ObjectLifeMonitor>& data);
-
-  v8::Global<v8::Object> target_;
-
-  base::WeakPtrFactory<ObjectLifeMonitor> weak_ptr_factory_{this};
-};
-
-}  // namespace electron
-
-#endif  // ELECTRON_SHELL_COMMON_API_OBJECT_LIFE_MONITOR_H_

shell/renderer/api/context_bridge/object_cache.cc

@@ -4,7 +4,8 @@
 
 #include "shell/renderer/api/context_bridge/object_cache.h"
 
-#include "shell/common/api/object_life_monitor.h"
+#include "v8/include/v8-local-handle.h"
+#include "v8/include/v8-object.h"
 
 namespace electron::api::context_bridge {
 

shell/renderer/api/electron_api_context_bridge.cc

@@ -16,7 +16,6 @@
 #include "base/trace_event/trace_event.h"
 #include "content/public/renderer/render_frame.h"
 #include "content/public/renderer/render_frame_observer.h"
-#include "shell/common/api/object_life_monitor.h"
 #include "shell/common/gin_converters/blink_converter.h"
 #include "shell/common/gin_converters/callback_converter.h"
 #include "shell/common/gin_helper/dictionary.h"