Removes code using mus client lib

ui/views/test/platform_test_helper.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 "ui/views/test/platform_test_helper.h"
 
 #include "base/callback.h"
 #include "base/logging.h"
 #include "base/memory/ptr_util.h"
 #include "ui/views/widget/widget.h"
 
 #if defined(USE_AURA)
 #include "ui/aura/window.h"
 #endif
 
 namespace views {
 namespace {
 
 PlatformTestHelper::Factory test_helper_factory;
 bool is_mus = false;
-bool is_aura_mus_client = false;
 
 }  // namespace
 
 void PlatformTestHelper::set_factory(const Factory& factory) {
   DCHECK(test_helper_factory.is_null());
   test_helper_factory = factory;
 }
 
 // static
 std::unique_ptr<PlatformTestHelper> PlatformTestHelper::Create() {
   return !test_helper_factory.is_null()
              ? test_helper_factory.Run()
              : base::WrapUnique(new PlatformTestHelper);
 }
 
 // static
 void PlatformTestHelper::SetIsMus() {
   is_mus = true;
 }
 
 // static
 bool PlatformTestHelper::IsMus() {
   return is_mus;
 }
 
-// static
-void PlatformTestHelper::SetIsAuraMusClient() {
-  is_aura_mus_client = true;
-}
-
-// static
-bool PlatformTestHelper::IsAuraMusClient() {
-  return is_aura_mus_client;
-}
-
 #if defined(USE_AURA)
 void PlatformTestHelper::SimulateNativeDestroy(Widget* widget) {
   delete widget->GetNativeView();
 }
 #endif
 
 }  // namespace views