Make ApplicationTestBase not use ApplicationImpl.

services/js/network_apptest.cc

 // Copyright 2014 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/files/file_util.h"
 #include "mojo/public/cpp/application/connect.h"
 #include "services/js/test/js_application_test_base.h"
 #include "services/js/test/network_test_service.mojom.h"
 
 namespace js {
 namespace {
 
 class JSNetworkTest : public test::JSApplicationTestBase {
  public:
   JSNetworkTest() : JSApplicationTestBase() {}
   ~JSNetworkTest() override {}
 
  protected:
   // ApplicationTestBase:
   void SetUp() override {
     ApplicationTestBase::SetUp();
     const std::string& url = JSAppURL("network_test.js");
-    mojo::ConnectToService(application_impl()->shell(), url,
-                           GetProxy(&network_test_service_));
+    mojo::ConnectToService(shell(), url, GetProxy(&network_test_service_));
   }
 
   NetworkTestServicePtr network_test_service_;
 
  private:
   MOJO_DISALLOW_COPY_AND_ASSIGN(JSNetworkTest);
 };
 
 struct GetFileSizeCallback {
   GetFileSizeCallback(bool* b, uint64* s) : ok(b), size(s) {}
@@ skipping 20 matching lines @@
   network_test_service_->GetFileSize(JSAppURL(filename), callback);
   EXPECT_TRUE(network_test_service_.WaitForIncomingResponse());
   EXPECT_TRUE(file_size_ok);
   EXPECT_EQ(file_size, static_cast<uint64>(expected_file_size));
   network_test_service_->Quit();
 }
 
 }  // namespace
 }  // namespace js