Remove shell::Loader

services/shell/tests/placeholder_unittest.cc

 // Copyright 2016 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 "testing/gtest/include/gtest/gtest.h"
-#include "testing/gtest_mac.h"
 
-int main(int argc, char* argv[]) {
-  ::testing::InitGoogleTest(&argc, argv);
-  return RUN_ALL_TESTS();
-}
+// Dummy test to keep mojo_shell_unittests building and linking in GYP builds.
+TEST(PlaceholderTest, Empty) {}