Open the LoginDatabase on the DB thread, not the UI thread.

components/password_manager/core/browser/password_store_default_unittest.cc

Index: components/password_manager/core/browser/password_store_default_unittest.cc
diff --git a/components/password_manager/core/browser/password_store_default_unittest.cc b/components/password_manager/core/browser/password_store_default_unittest.cc
index c2b0bbe158436a3336f4c204a74c089b194f0922..20248efca6d1633e4c013ffb3d1bb463270a0c0e 100644
--- a/components/password_manager/core/browser/password_store_default_unittest.cc
+++ b/components/password_manager/core/browser/password_store_default_unittest.cc
@@ -45,15 +45,15 @@ class PasswordStoreDefaultTest : public testing::Test {
  protected:
   void SetUp() override {
     ASSERT_TRUE(temp_dir_.CreateUniqueTempDir());
-    login_db_.reset(new LoginDatabase());
-    ASSERT_TRUE(login_db_->Init(temp_dir_.path().Append(
-        FILE_PATH_LITERAL("login_test"))));
   }
 
   void TearDown() override { ASSERT_TRUE(temp_dir_.Delete()); }
 
+  base::FilePath test_login_db_file_path() const {
+    return temp_dir_.path().Append(FILE_PATH_LITERAL("login_test"));
+  }
+
   base::MessageLoopForUI message_loop_;
-  scoped_ptr<LoginDatabase> login_db_;
   base::ScopedTempDir temp_dir_;
 };
 
@@ -65,7 +65,7 @@ TEST_F(PasswordStoreDefaultTest, NonASCIIData) {
   scoped_refptr<PasswordStoreDefault> store(new PasswordStoreDefault(
       base::MessageLoopProxy::current(),
       base::MessageLoopProxy::current(),
-      login_db_.release()));
+      test_login_db_file_path()));
   store->Init(syncer::SyncableService::StartSyncFlare());
 
   // Some non-ASCII password form data.
@@ -111,7 +111,7 @@ TEST_F(PasswordStoreDefaultTest, Notifications) {
   scoped_refptr<PasswordStoreDefault> store(new PasswordStoreDefault(
       base::MessageLoopProxy::current(),
       base::MessageLoopProxy::current(),
-      login_db_.release()));
+      test_login_db_file_path()));
   store->Init(syncer::SyncableService::StartSyncFlare());
 
   PasswordFormData form_data =