Converts ash to use aura-mus

mash/test/mash_test_suite.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 "mash/test/mash_test_suite.h"
 
 #include "base/files/file_path.h"
 #include "base/path_service.h"
 #include "ui/aura/env.h"
 #include "ui/base/resource/resource_bundle.h"
@@ skipping 11 matching lines @@
 void MashTestSuite::Initialize() {
   base::TestSuite::Initialize();
 
   // Load ash mus strings and resources; not 'common' (Chrome) resources.
   base::FilePath resources;
   PathService::Get(base::DIR_MODULE, &resources);
   resources = resources.Append(FILE_PATH_LITERAL("ash_mus_resources.pak"));
   ui::ResourceBundle::InitSharedInstanceWithPakPath(resources);
 
   base::DiscardableMemoryAllocator::SetInstance(&discardable_memory_allocator_);
-  env_ = aura::Env::CreateInstance();
+  env_ = aura::Env::CreateInstance(aura::Env::Mode::MUS);
   gl::GLSurfaceTestSupport::InitializeOneOff();
   const bool enable_pixel_output = false;
   env_->set_context_factory(
       ui::InitializeContextFactoryForTests(enable_pixel_output));
 }
 
 void MashTestSuite::Shutdown() {
   ui::TerminateContextFactoryForTests();
   env_.reset();
   ui::ResourceBundle::CleanupSharedInstance();
   base::TestSuite::Shutdown();
 }
 
 }  // namespace test
 }  // namespace mash