Adapt Chrome OS related part of ChildAccountService.

components/user_manager/user.cc

Index: components/user_manager/user.cc
diff --git a/components/user_manager/user.cc b/components/user_manager/user.cc
index 7035096fe374448b5547ab67913f6b0ecacab11b..2fbd910e923e0957998908402ac924dec86da170 100644
--- a/components/user_manager/user.cc
+++ b/components/user_manager/user.cc
@@ -136,7 +136,10 @@ std::string User::GetUserID() const {
 
 void User::SetIsSupervised(bool is_supervised) {
   VLOG(1) << "Ignoring SetIsSupervised call with param " << is_supervised;
-  NOTREACHED() << "Calling SetIsSupervised for base User class.";
+  if (is_supervised) {
+    NOTREACHED() << "Calling SetIsSupervised(true) for base User class. "
+                 << "Base class cannot be set as supervised";
+  }
 }
 
 bool User::HasGaiaAccount() const {