Special check on Supervised User creation flow added to prevent misleading shelf alignment.

ash/shell/shell_delegate_impl.cc

Index: ash/shell/shell_delegate_impl.cc
diff --git a/ash/shell/shell_delegate_impl.cc b/ash/shell/shell_delegate_impl.cc
index c9de8850a283378b14731f82112bce868d13638b..7c0a9e6e9aa9029b0bed5910129061d8d4d6ac96 100644
--- a/ash/shell/shell_delegate_impl.cc
+++ b/ash/shell/shell_delegate_impl.cc
@@ -109,6 +109,10 @@ class SessionStateDelegateImpl : public SessionStateDelegate {
   bool IsUserSessionBlocked() const override {
     return !IsActiveUserSessionStarted() || IsScreenLocked();
   }
+
+  bool IsInSupervisedUserCreationFlow() const override {
+  }
+
   SessionState GetSessionState() const override {
     // Assume that if session is not active we're at login.
     return IsActiveUserSessionStarted() ? SESSION_STATE_ACTIVE