Move free disk space check to session_manager.

chrome/browser/chromeos/settings/device_settings_test_helper.cc

Index: chrome/browser/chromeos/settings/device_settings_test_helper.cc
diff --git a/chrome/browser/chromeos/settings/device_settings_test_helper.cc b/chrome/browser/chromeos/settings/device_settings_test_helper.cc
index d2735a08901d71ae01c3f0fb039a35e8ad6bcfc5..9a3ba21b9ee657b81a3f1df26d210f089657c74b 100644
--- a/chrome/browser/chromeos/settings/device_settings_test_helper.cc
+++ b/chrome/browser/chromeos/settings/device_settings_test_helper.cc
@@ -188,7 +188,7 @@ void DeviceSettingsTestHelper::CheckArcAvailability(
 void DeviceSettingsTestHelper::StartArcInstance(
     const cryptohome::Identification& cryptohome_id,
     bool disable_boot_completed_broadcast,
-    const ArcCallback& callback) {}
+    const StartArcInstanceCallback& callback) {}
 
 void DeviceSettingsTestHelper::StopArcInstance(const ArcCallback& callback) {}