Removing 'AllowScopedIO' exception from SecurityKeyAuthHandlerLinux

remoting/host/security_key/security_key_extension.cc

 // Copyright 2016 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 "remoting/host/security_key/security_key_extension.h"
 
 #include "base/memory/ptr_util.h"
+#include "base/single_thread_task_runner.h"
 #include "remoting/host/security_key/security_key_extension_session.h"
 
 namespace {
 // TODO(joedow): Update this once clients support sending a security key
 //               capabililty.  Tracked via: crbug.com/587485
 const char kCapability[] = "";
 }
 
 namespace remoting {
 
-SecurityKeyExtension::SecurityKeyExtension() {}
+SecurityKeyExtension::SecurityKeyExtension(
+    scoped_refptr<base::SingleThreadTaskRunner> file_task_runner)
+    : file_task_runner_(file_task_runner) {}
 
 SecurityKeyExtension::~SecurityKeyExtension() {}
 
 std::string SecurityKeyExtension::capability() const {
   return kCapability;
 }
 
 std::unique_ptr<HostExtensionSession>
 SecurityKeyExtension::CreateExtensionSession(
     ClientSessionDetails* details,
     protocol::ClientStub* client_stub) {
   // TODO(joedow): Update this mechanism to allow for multiple sessions.  The
   //               extension will only send messages through the initial
   //               |client_stub| and |details| with the current design.
   return base::WrapUnique(
-      new SecurityKeyExtensionSession(details, client_stub));
+      new SecurityKeyExtensionSession(details, client_stub, file_task_runner_));
 }
 
 }  // namespace remoting