chromeos: Fix shelf appearing at login screen under mash

ash/common/test/test_session_state_delegate.cc

Index: ash/common/test/test_session_state_delegate.cc
diff --git a/ash/common/test/test_session_state_delegate.cc b/ash/common/test/test_session_state_delegate.cc
index 28b60f3ce53f666974d539b3bbbdb557fce8fef4..9132b8ce13f8d5883f10111ba7172d570a4fb57a 100644
--- a/ash/common/test/test_session_state_delegate.cc
+++ b/ash/common/test/test_session_state_delegate.cc
@@ -161,12 +161,9 @@ session_manager::SessionState TestSessionStateDelegate::GetSessionState()
 }
 
 void TestSessionStateDelegate::SetHasActiveUser(bool has_active_user) {
-  if (!has_active_user) {
-    session_state_ = session_manager::SessionState::LOGIN_PRIMARY;
-  } else {
-    session_state_ = session_manager::SessionState::ACTIVE;
-    WmShell::Get()->ShowShelf();
-  }
+  session_state_ = has_active_user
+                       ? session_manager::SessionState::ACTIVE
+                       : session_manager::SessionState::LOGIN_PRIMARY;
 }
 
 void TestSessionStateDelegate::SetActiveUserSessionStarted(