Make ApplicationTestBase not use ApplicationImpl.

services/asset_bundle/asset_bundle_apptest.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 "base/bind.h"
 #include "base/files/file_path.h"
 #include "base/files/file_util.h"
 #include "base/files/scoped_temp_dir.h"
 #include "base/run_loop.h"
 #include "mojo/data_pipe_utils/data_pipe_utils.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/asset_bundle/interfaces/asset_bundle.mojom.h"
 #include "third_party/zlib/google/zip.h"
 
 namespace asset_bundle {
 
 class AssetBundleAppTest : public mojo::test::ApplicationTestBase {
  public:
   AssetBundleAppTest() {}
   ~AssetBundleAppTest() override {}
 
   void SetUp() override {
     mojo::test::ApplicationTestBase::SetUp();
-    mojo::ConnectToService(application_impl()->shell(), "mojo:asset_bundle",
+    mojo::ConnectToService(shell(), "mojo:asset_bundle",
                            GetProxy(&asset_unpacker_));
   }
 
  protected:
   mojo::asset_bundle::AssetUnpackerPtr asset_unpacker_;
 
   DISALLOW_COPY_AND_ASSIGN(AssetBundleAppTest);
 };
 
 TEST_F(AssetBundleAppTest, CanGetText) {
@@ skipping 51 matching lines @@
       [&](mojo::ScopedDataPipeConsumerHandle asset_pipe) {
     mojo::common::BlockingCopyToString(asset_pipe.Pass(), &outside_content);
   });
   ASSERT_TRUE(asset_bundle.WaitForIncomingResponse());
 
   EXPECT_EQ("", outside_content)
       << "Traversing outside of bundle is treated as an empty data stream";
 }
 
 }  // namespace asset_bundle