Loading the Launcher with a Locked Profile launched UserManager.

chrome/browser/ui/app_list/test/fake_profile_store.cc

Index: chrome/browser/ui/app_list/test/fake_profile_store.cc
diff --git a/chrome/browser/ui/app_list/test/fake_profile_store.cc b/chrome/browser/ui/app_list/test/fake_profile_store.cc
index 9fc639c60139838f9335a29a590fd2c2dcfecd4d..641940f32be5e33d3d8ed35d48c25f1bcf333538 100644
--- a/chrome/browser/ui/app_list/test/fake_profile_store.cc
+++ b/chrome/browser/ui/app_list/test/fake_profile_store.cc
@@ -62,3 +62,7 @@ base::FilePath FakeProfileStore::GetUserDataDir() {
 bool FakeProfileStore::IsProfileSupervised(const base::FilePath& path) {
   return false;
 }
+
+bool FakeProfileStore::IsProfileLocked(const base::FilePath& path) {
+  return false;
+}