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

mojo/services/html_viewer/ax_provider_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/run_loop.h"
 #include "base/strings/stringprintf.h"
 #include "base/test/test_timeouts.h"
+#include "mojo/application/application_test_base_chromium.h"
 #include "mojo/public/cpp/application/application_impl.h"
-#include "mojo/public/cpp/application/application_test_base.h"
 #include "net/test/spawned_test_server/spawned_test_server.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "third_party/mojo_services/src/accessibility/public/interfaces/accessibility.mojom.h"
 
 namespace mojo {
 
 namespace {
 
 base::RunLoop* current_run_loop = nullptr;
 
@@ skipping 58 matching lines @@
                          QuitRunLoop();
                        });
   ASSERT_TRUE(DoRunLoopWithTimeout());
 
   EXPECT_TRUE(AxTreeContainsText(ax_tree, "Hello "));
   EXPECT_TRUE(AxTreeContainsText(ax_tree, "World!"));
   EXPECT_FALSE(AxTreeContainsText(ax_tree, "foo"));
 }
 
 }  // namespace mojo