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