Fix a bug that incorrectly kicked off the upgrade task.

chrome/browser/upgrade_detector_impl.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/upgrade_detector_impl.h"
 
 #include <string>
 
 #include "base/bind.h"
 #include "base/command_line.h"
@@ skipping 58 matching lines @@
 class DetectUpgradeTask : public Task {
  public:
   DetectUpgradeTask(const base::Closure& upgrade_detected_task,
                     bool* is_unstable_channel,
                     bool* is_critical_upgrade)
       : upgrade_detected_task_(upgrade_detected_task),
         is_unstable_channel_(is_unstable_channel),
         is_critical_upgrade_(is_critical_upgrade) {
   }
 
-  virtual ~DetectUpgradeTask() {
-    if (!upgrade_detected_task_.is_null()) {
-      // This has to get deleted on the same thread it was created.
-      BrowserThread::PostTask(BrowserThread::UI, FROM_HERE,
-                              upgrade_detected_task_);
-    }
-  }
-
   virtual void Run() {
     DCHECK(BrowserThread::CurrentlyOn(BrowserThread::FILE));
 
     scoped_ptr<Version> installed_version;
     scoped_ptr<Version> critical_update;
 
 #if defined(OS_WIN)
     // Get the version of the currently *installed* instance of Chrome,
     // which might be newer than the *running* instance if we have been
     // upgraded in the background.
@@ skipping 191 matching lines @@
 
 // static
 UpgradeDetectorImpl* UpgradeDetectorImpl::GetInstance() {
   return Singleton<UpgradeDetectorImpl>::get();
 }
 
 // static
 UpgradeDetector* UpgradeDetector::GetInstance() {
   return UpgradeDetectorImpl::GetInstance();
 }