Removing file_thread_task_runner parameter from SerialIoHandler

tools/battor_agent/battor_connection_impl.h

 // 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.
 
 #ifndef TOOLS_BATTOR_AGENT_BATTOR_CONNECTION_IMPL_H_
 #define TOOLS_BATTOR_AGENT_BATTOR_CONNECTION_IMPL_H_
 
 #include <fstream>
 #include <vector>
 
@@ skipping 17 matching lines @@
 namespace battor {
 
 // A BattOrConnectionImpl is a concrete implementation of a BattOrConnection.
 class BattOrConnectionImpl
     : public BattOrConnection,
       public base::SupportsWeakPtr<BattOrConnectionImpl> {
  public:
   BattOrConnectionImpl(
       const std::string& path,
       BattOrConnection::Listener* listener,
-      scoped_refptr<base::SingleThreadTaskRunner> file_thread_task_runner,
       scoped_refptr<base::SingleThreadTaskRunner> ui_thread_task_runner);
   ~BattOrConnectionImpl() override;
 
   void Open() override;
   void Close() override;
   void SendBytes(BattOrMessageType type,
                  const void* buffer,
                  size_t bytes_to_send) override;
   void ReadMessage(BattOrMessageType type) override;
   void CancelReadMessage() override;
@@ skipping 49 matching lines @@
   std::vector<char> already_read_buffer_;
   // The bytes that were read in the pending read.
   scoped_refptr<net::IOBuffer> pending_read_buffer_;
   // The type of message we're looking for in the pending read.
   BattOrMessageType pending_read_message_type_;
 
   // The total number of bytes that we're expecting to send.
   size_t pending_write_length_;
 
   // Threads needed for serial communication.
-  scoped_refptr<base::SingleThreadTaskRunner> file_thread_task_runner_;
   scoped_refptr<base::SingleThreadTaskRunner> ui_thread_task_runner_;
 
   std::fstream serial_log_;
 
   DISALLOW_COPY_AND_ASSIGN(BattOrConnectionImpl);
 };
 
 }  // namespace battor
 
 #endif  // TOOLS_BATTOR_AGENT_BATTOR_CONNECTION_IMPL_H_