Consolidate data storage and notifications in the cloud policy subsystem

chrome/browser/policy/logging_work_scheduler.cc

 // Copyright (c) 2011 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 "chrome/browser/policy/logging_work_scheduler.h"
 
 #include <algorithm>
 
 #include "base/compiler_specific.h"
 #include "content/browser/browser_thread.h"
@@ skipping 124 matching lines @@
 }
 
 void LoggingWorkScheduler::PostDelayedWork(
     const base::Closure& callback, int64 delay) {
   DCHECK(!callback_.get() || callback_->is_null());
   callback_.reset(new base::Closure(callback));
   logger_->PostDelayedWork(callback_, delay);
 }
 
 void LoggingWorkScheduler::CancelDelayedWork() {
-  DCHECK(callback_.get());
-  callback_->Reset();
+  if (!callback_.get()) return;
+  callback_->Reset();  // Erase the callback to the delayed work.
+  callback_.reset(NULL);  // Erase the pointer to the callback.
 }
 
 }  // namespace policy