Removing 'AllowScopedIO' exception from SecurityKeyAuthHandlerLinux

remoting/host/security_key/security_key_extension.h

Index: remoting/host/security_key/security_key_extension.h
diff --git a/remoting/host/security_key/security_key_extension.h b/remoting/host/security_key/security_key_extension.h
index 4f4fc4c249612b051aeff67bf1a54634cb3a9710..e5f8b32b478d148952f995cb5c550dc7837c0d54 100644
--- a/remoting/host/security_key/security_key_extension.h
+++ b/remoting/host/security_key/security_key_extension.h
@@ -9,8 +9,13 @@
 #include <string>
 
 #include "base/macros.h"
+#include "base/memory/ref_counted.h"
 #include "remoting/host/host_extension.h"
 
+namespace base {
+class SingleThreadTaskRunner;
+}  // namespace base
+
 namespace remoting {
 
 class ClientSessionDetails;
@@ -19,7 +24,8 @@ class HostExtensionSession;
 // SecurityKeyExtension extends HostExtension to enable Security Key support.
 class SecurityKeyExtension : public HostExtension {
  public:
-  SecurityKeyExtension();
+  explicit SecurityKeyExtension(
+      scoped_refptr<base::SingleThreadTaskRunner> file_task_runner);
   ~SecurityKeyExtension() override;
 
   // HostExtension interface.
@@ -29,6 +35,9 @@ class SecurityKeyExtension : public HostExtension {
       protocol::ClientStub* client_stub) override;
 
  private:
+  // Allows underlying auth handler to perform blocking file IO.
+  scoped_refptr<base::SingleThreadTaskRunner> file_task_runner_;
+
   DISALLOW_COPY_AND_ASSIGN(SecurityKeyExtension);
 };