Wait for Cryptohome service to be available on login.

chrome/browser/chromeos/login/existing_user_controller_browsertest.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include <string>
 #include <vector>
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/callback.h"
@@ skipping 766 matching lines @@
     policy::DevicePolicyCrosTestHelper::MarkAsActiveDirectoryEnterpriseOwned(
         kActiveDirectoryRealm);
   }
 
   // Overriden from ExistingUserControllerTest:
   void SetUpInProcessBrowserTestFixture() override {
     RefreshDevicePolicy();
     ExistingUserControllerTest::SetUpInProcessBrowserTestFixture();
   }
 
+  void TearDownOnMainThread() override {
+    base::RunLoop().RunUntilIdle();
+    ExistingUserControllerTest::TearDownOnMainThread();
+  }
+
  protected:
   void ExpectLoginFailure() {
     EXPECT_CALL(*mock_login_display_, SetUIEnabled(false)).Times(2);
     EXPECT_CALL(*mock_login_display_,
                 ShowError(IDS_LOGIN_ERROR_GOOGLE_ACCOUNT_NOT_ALLOWED, 1,
                           HelpAppLauncher::HELP_CANT_ACCESS_ACCOUNT))
         .Times(1);
     EXPECT_CALL(*mock_login_display_, SetUIEnabled(true)).Times(1);
   }
   void ExpectLoginSuccess() {
@@ skipping 41 matching lines @@
                        GAIAAccountLogin_Failure) {
   ExpectLoginFailure();
   EXPECT_CALL(*mock_login_display_host_, OnCompleteLogin()).Times(1);
   UserContext user_context(gaia_account_id_);
   user_context.SetKey(Key(kPassword));
   user_context.SetUserIDHash(gaia_account_id_.GetUserEmail());
   existing_user_controller()->CompleteLogin(user_context);
 }
 
 }  // namespace chromeos