Pass error messages from native messaging to web-app.

remoting/host/setup/daemon_controller_delegate_linux.h

 // Copyright 2013 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 REMOTING_HOST_SETUP_DAEMON_CONTROLLER_DELEGATE_LINUX_H_
 #define REMOTING_HOST_SETUP_DAEMON_CONTROLLER_DELEGATE_LINUX_H_
 
 #include "base/memory/scoped_ptr.h"
 #include "remoting/host/setup/daemon_controller.h"
 
 namespace remoting {
 
 class DaemonControllerDelegateLinux : public DaemonController::Delegate {
  public:
   DaemonControllerDelegateLinux();
   ~DaemonControllerDelegateLinux() override;
 
   // DaemonController::Delegate interface.
   DaemonController::State GetState() override;
   scoped_ptr<base::DictionaryValue> GetConfig() override;
   void SetConfigAndStart(
       scoped_ptr<base::DictionaryValue> config,
       bool consent,
-      const DaemonController::CompletionCallback& done) override;
-  void UpdateConfig(scoped_ptr<base::DictionaryValue> config,
-                    const DaemonController::CompletionCallback& done) override;
-  void Stop(const DaemonController::CompletionCallback& done) override;
+      const base::Closure& on_done,
+      const DaemonController::ErrorCallback& on_error) override;
+  void UpdateConfig(
+      scoped_ptr<base::DictionaryValue> config,
+      const base::Closure& on_done,
+      const DaemonController::ErrorCallback& on_error) override;
+  void Stop(
+      const base::Closure& on_done,
+      const DaemonController::ErrorCallback& on_error) override;
   DaemonController::UsageStatsConsent GetUsageStatsConsent() override;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(DaemonControllerDelegateLinux);
 };
 
 }  // namespace remoting
 
 #endif  // REMOTING_HOST_SETUP_DAEMON_CONTROLLER_DELEGATE_LINUX_H_