Fix memory leak with ScriptedIdleTaskController

third_party/WebKit/Source/core/dom/ScriptedIdleTaskController.cpp

 // Copyright 2015 The Chromium 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 "core/dom/ScriptedIdleTaskController.h"
 
 #include "core/dom/ExecutionContext.h"
 #include "core/dom/IdleRequestCallback.h"
 #include "core/dom/IdleRequestOptions.h"
 #include "core/frame/PerformanceMonitor.h"
@@ skipping 44 matching lines @@
 
   ScriptedIdleTaskController::CallbackId id() const { return m_id; }
   ScriptedIdleTaskController* controller() const { return m_controller; }
 
  private:
   IdleRequestCallbackWrapper(ScriptedIdleTaskController::CallbackId id,
                              ScriptedIdleTaskController* controller)
       : m_id(id), m_controller(controller) {}
 
   ScriptedIdleTaskController::CallbackId m_id;
-  Persistent<ScriptedIdleTaskController> m_controller;
+  WeakPersistent<ScriptedIdleTaskController> m_controller;
 };
 
 }  // namespace internal
 
 ScriptedIdleTaskController::ScriptedIdleTaskController(
     ExecutionContext* context)
     : SuspendableObject(context),
       m_scheduler(Platform::current()->currentThread()->scheduler()),
       m_nextCallbackId(0),
       m_suspended(false) {
@@ skipping 136 matching lines @@
     RefPtr<internal::IdleRequestCallbackWrapper> callbackWrapper =
         internal::IdleRequestCallbackWrapper::create(callback.key, this);
     m_scheduler->postIdleTask(
         BLINK_FROM_HERE,
         WTF::bind(&internal::IdleRequestCallbackWrapper::idleTaskFired,
                   callbackWrapper));
   }
 }
 
 }  // namespace blink