Don't create a new profile when cleaning up stale ephemeral profiles.

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 641940f32be5e33d3d8ed35d48c25f1bcf333538..dbf70be08ed9b111fd6729ebff0ea4537266627e 100644
--- a/chrome/browser/ui/app_list/test/fake_profile_store.cc
+++ b/chrome/browser/ui/app_list/test/fake_profile_store.cc
@@ -59,6 +59,10 @@ base::FilePath FakeProfileStore::GetUserDataDir() {
   return user_data_dir_;
 }
 
+std::string FakeProfileStore::GetLastUsedProfileName() {
+  return std::string();
+}
+
 bool FakeProfileStore::IsProfileSupervised(const base::FilePath& path) {
   return false;
 }