Remove Task inheritance from base::Timer.

base/timer.cc

 // Copyright (c) 2006-2008 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 "base/timer.h"
 
+#include "base/bind.h"
+#include "base/bind_helpers.h"
 #include "base/message_loop.h"
 
 namespace base {
 
 void BaseTimer_Helper::OrphanDelayedTask() {
   if (delayed_task_) {
     delayed_task_->timer_ = NULL;
     delayed_task_ = NULL;
   }
 }
 
 void BaseTimer_Helper::InitiateDelayedTask(TimerTask* timer_task) {
   OrphanDelayedTask();
 
   delayed_task_ = timer_task;
   delayed_task_->timer_ = this;
   MessageLoop::current()->PostDelayedTask(
-      timer_task->posted_from_, timer_task,
+      timer_task->posted_from_,
+      base::Bind(&TimerTask::Run, base::Unretained(timer_task)),
       static_cast<int>(timer_task->delay_.InMillisecondsRoundedUp()));
 }
 
 }  // namespace base