Removing file_thread_task_runner parameter from SerialIoHandler

tools/battor_agent/battor_agent.cc

 // 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 "tools/battor_agent/battor_agent.h"
 
 #include <iomanip>
 
 #include "base/bind.h"
 #include "base/threading/thread_task_runner_handle.h"
 #include "tools/battor_agent/battor_connection_impl.h"
@@ skipping 90 matching lines @@
   samples->resize(remaining_bytes / sizeof(RawBattOrSample));
   memcpy(samples->data(), frame_ptr, remaining_bytes);
 
   return true;
 }
 }  // namespace
 
 BattOrAgent::BattOrAgent(
     const std::string& path,
     Listener* listener,
-    scoped_refptr<base::SingleThreadTaskRunner> file_thread_task_runner,
     scoped_refptr<base::SingleThreadTaskRunner> ui_thread_task_runner)
     : connection_(new BattOrConnectionImpl(path,
                                            this,
-                                           file_thread_task_runner,
                                            ui_thread_task_runner)),
       listener_(listener),
       last_action_(Action::INVALID),
       command_(Command::INVALID),
       num_command_attempts_(0) {
   // We don't care what thread the constructor is called on - we only care that
   // all of the other method invocations happen on the same thread.
   thread_checker_.DetachFromThread();
 }
 
@@ skipping 498 matching lines @@
 
 void BattOrAgent::SetActionTimeout(uint16_t timeout_seconds) {
   timeout_callback_.Reset(
       base::Bind(&BattOrAgent::OnActionTimeout, AsWeakPtr()));
   base::ThreadTaskRunnerHandle::Get()->PostDelayedTask(
       FROM_HERE, timeout_callback_.callback(),
       base::TimeDelta::FromSeconds(timeout_seconds));
 }
 
 }  // namespace battor