Pass error messages from native messaging to web-app.

remoting/host/setup/daemon_controller_delegate_linux.h

Index: remoting/host/setup/daemon_controller_delegate_linux.h
diff --git a/remoting/host/setup/daemon_controller_delegate_linux.h b/remoting/host/setup/daemon_controller_delegate_linux.h
index 91eef1a2af5f0616bbb0e2f623009db4ebf03ff9..0a9d8d6eada35913ace9315a91c92544de26350b 100644
--- a/remoting/host/setup/daemon_controller_delegate_linux.h
+++ b/remoting/host/setup/daemon_controller_delegate_linux.h
@@ -21,10 +21,15 @@ class DaemonControllerDelegateLinux : public DaemonController::Delegate {
   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: