Update Managed user strings for ChromeOS

ash/system/tray/test_system_tray_delegate.cc

Index: ash/system/tray/test_system_tray_delegate.cc
diff --git a/ash/system/tray/test_system_tray_delegate.cc b/ash/system/tray/test_system_tray_delegate.cc
index c2eb2df5edd1e68faedad330d38f6707d1537b32..30922870c2eb7f0d314abb972652025f13c64776 100644
--- a/ash/system/tray/test_system_tray_delegate.cc
+++ b/ash/system/tray/test_system_tray_delegate.cc
@@ -104,6 +104,11 @@ const std::string TestSystemTrayDelegate::GetLocallyManagedUserManager() const {
   return std::string();
 }
 
+const base::string16 TestSystemTrayDelegate::GetLocallyManagedUserManagerName()
+    const {
+  return string16();
+}
+
 const base::string16 TestSystemTrayDelegate::GetLocallyManagedUserMessage()
     const {
   return string16();