Simplify mojo_shell since it's now only used for Mandoline.

mojo/shell/shell_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/base_paths.h"
 #include "base/bind.h"
 #include "base/files/file_path.h"
 #include "base/files/file_util.h"
 #include "base/path_service.h"
 #include "base/run_loop.h"
 #include "base/strings/string_util.h"
 #include "base/strings/stringprintf.h"
+#include "mojo/application/application_test_base_chromium.h"
 #include "mojo/common/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/system/macros.h"
 #include "mojo/services/http_server/public/cpp/http_server_util.h"
 #include "mojo/services/http_server/public/interfaces/http_server.mojom.h"
 #include "mojo/services/http_server/public/interfaces/http_server_factory.mojom.h"
 #include "mojo/services/network/public/interfaces/net_address.mojom.h"
 #include "mojo/shell/kPingable.h"
 #include "mojo/shell/test/pingable.mojom.h"
 
 namespace mojo {
 namespace {
@@ skipping 162 matching lines @@
     EXPECT_EQ(app_url.To<std::string>() + "?foo", connection_url);
     EXPECT_EQ("hello", message);
     base::MessageLoop::current()->Quit();
   };
   pingable->Ping("hello", callback);
   base::RunLoop().Run();
 }
 
 }  // namespace
 }  // namespace mojo