Move free disk space check to session_manager.

chrome/browser/chromeos/settings/device_settings_test_helper.h

Index: chrome/browser/chromeos/settings/device_settings_test_helper.h
diff --git a/chrome/browser/chromeos/settings/device_settings_test_helper.h b/chrome/browser/chromeos/settings/device_settings_test_helper.h
index 074edf839f02b54916934c78bd93f4112eb99b63..b30a8105ebd68305e074829233bc0cb2e4287297 100644
--- a/chrome/browser/chromeos/settings/device_settings_test_helper.h
+++ b/chrome/browser/chromeos/settings/device_settings_test_helper.h
@@ -124,7 +124,7 @@ class DeviceSettingsTestHelper : public SessionManagerClient {
   void CheckArcAvailability(const ArcCallback& callback) override;
   void StartArcInstance(const cryptohome::Identification& cryptohome_id,
                         bool disable_boot_completed_broadcast,
-                        const ArcCallback& callback) override;
+                        const StartArcInstanceCallback& callback) override;
   void StopArcInstance(const ArcCallback& callback) override;
   void PrioritizeArcInstance(const ArcCallback& callback) override;
   void EmitArcBooted() override;