Make ApplicationTestBase not use ApplicationImpl.

services/authentication/accounts_db_manager_unittest.cc

 // Copyright 2016 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 "accounts_db_manager.h"
 
 #include "base/logging.h"
 #include "base/strings/string_tokenizer.h"
-#include "mojo/public/cpp/application/application_impl.h"
 #include "mojo/public/cpp/application/application_test_base.h"
 #include "mojo/public/cpp/application/connect.h"
 #include "mojo/services/files/interfaces/types.mojom.h"
 #include "services/authentication/credentials_impl_db.mojom.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace authentication {
 namespace {
 
 class AccountsDBTest : public mojo::test::ApplicationTestBase {
  public:
   AccountsDBTest(){};
   ~AccountsDBTest() override{};
 
  protected:
   void SetUp() override {
     mojo::test::ApplicationTestBase::SetUp();
     mojo::files::FilesPtr files;
-    mojo::ConnectToService(application_impl()->shell(), "mojo:files",
-                           GetProxy(&files));
+    mojo::ConnectToService(shell(), "mojo:files", GetProxy(&files));
 
     mojo::files::Error error = mojo::files::Error::INTERNAL;
     mojo::files::DirectoryPtr directory;
     files->OpenFileSystem(nullptr, GetProxy(&directory),
                           [&error](mojo::files::Error e) { error = e; });
     CHECK(files.WaitForIncomingResponse());
     CHECK_EQ(mojo::files::Error::OK, error);
 
     accounts_db_manager_ = new AccountsDbManager(directory.Pass());
   }
@@ skipping 113 matching lines @@
 }
 
 TEST_F(AccountsDBTest, CanGetAuthorizedUserForInvalidApp) {
   accountsDBPtr()->UpdateAuthorization("url1", "user1");
   ASSERT_TRUE(
       accountsDBPtr()->GetAuthorizedUserForApp("invalid_app_url").is_null());
 }
 
 }  // namespace
 }  // namespace authentication