Make ApplicationTestBase not use ApplicationImpl.

mojo/file_utils/file_util_unittest.cc

 // Copyright 2015 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 <stdint.h>
 #include <string.h>
 
 #include <utility>
 #include <vector>
 
 #include "mojo/file_utils/file_util.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/public/cpp/bindings/synchronous_interface_ptr.h"
 #include "mojo/public/cpp/utility/run_loop.h"
 #include "mojo/services/files/interfaces/directory.mojom-sync.h"
 #include "mojo/services/files/interfaces/file.mojom-sync.h"
 #include "mojo/services/files/interfaces/files.mojom-sync.h"
 
 namespace file_utils {
 namespace test {
@@ skipping 63 matching lines @@
       (*directory)
           ->OpenFile(path_name, GetSynchronousProxy(&temp_file),
                      mojo::files::kOpenFlagWrite | mojo::files::kOpenFlagRead,
                      &error));
   EXPECT_EQ(mojo::files::Error::OK, error);
   return temp_file;
 }
 
 TEST_F(FileUtilTest, BasicCreateTemporaryFile) {
   mojo::SynchronousInterfacePtr<mojo::files::Files> files;
-  mojo::ConnectToService(application_impl()->shell(), "mojo:files",
-                         GetSynchronousProxy(&files));
+  mojo::ConnectToService(shell(), "mojo:files", GetSynchronousProxy(&files));
 
   mojo::files::Error error = mojo::files::Error::INTERNAL;
   mojo::SynchronousInterfacePtr<mojo::files::Directory> directory;
   ASSERT_TRUE(files->OpenFileSystem(
       nullptr, mojo::GetSynchronousProxy(&directory), &error));
   EXPECT_EQ(mojo::files::Error::OK, error);
 
   std::string filename1;
   auto file1 = mojo::SynchronousInterfacePtr<mojo::files::File>::Create(
       CreateTemporaryFileInDir(&directory, &filename1));
@@ skipping 44 matching lines @@
 
   // Test that the files can be closed once more.
   CloseFileHelper(&file1);
   CloseFileHelper(&file2);
   CloseFileHelper(&file3);
 }
 
 }  // namespace
 }  // namespace test
 }  // namespace file_utils