Remove unnecessary posted task in cast_transport.cc.

extensions/browser/api/cast_channel/cast_transport.cc

 // Copyright 2014 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 "extensions/browser/api/cast_channel/cast_transport.h"
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include <string>
@@ skipping 309 matching lines @@
 
 int CastTransportImpl::DoWriteCallback() {
   VLOG_WITH_CONNECTION(2) << "DoWriteCallback";
   DCHECK(!write_queue_.empty());
 
   WriteRequest& request = write_queue_.front();
   int bytes_consumed = request.io_buffer->BytesConsumed();
   logger_->LogSocketEventForMessage(
       channel_id_, proto::MESSAGE_WRITTEN, request.message_namespace,
       base::StringPrintf("Bytes: %d", bytes_consumed));
-  base::ThreadTaskRunnerHandle::Get()->PostTask(FROM_HERE,
-                                                base::Bind(&base::DoNothing));
   base::ThreadTaskRunnerHandle::Get()->PostTask(
       FROM_HERE, base::Bind(request.callback, net::OK));
 
   write_queue_.pop();
   if (write_queue_.empty()) {
     SetWriteState(WRITE_STATE_IDLE);
   } else {
     SetWriteState(WRITE_STATE_WRITE);
   }
 
@@ skipping 128 matching lines @@
   VLOG_WITH_CONNECTION(2) << "DoReadHandleError";
   DCHECK_NE(CHANNEL_ERROR_NONE, error_state_);
   DCHECK_LE(result, 0);
   SetReadState(READ_STATE_ERROR);
   return net::ERR_FAILED;
 }
 
 }  // namespace cast_channel
 }  // namespace api
 }  // namespace extensions