views/mus: Fix some flaky crashes during test teardown.

ui/views/test/views_test_base.h

 // Copyright (c) 2012 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.
 
 #ifndef UI_VIEWS_TEST_VIEWS_TEST_BASE_H_
 #define UI_VIEWS_TEST_VIEWS_TEST_BASE_H_
 
 #include <memory>
 
 #include "base/macros.h"
@@ skipping 24 matching lines @@
   // testing::Test:
   void SetUp() override;
   void TearDown() override;
 
   void RunPendingMessages();
 
   // Creates a widget of |type| with any platform specific data for use in
   // cross-platform tests.
   Widget::InitParams CreateParams(Widget::InitParams::Type type);
 
-  // Use for tests that you should not create a NativeWidgetMus. Ideally we
-  // would use an ifdef, but for the time being we're not compiling differently,
-  // so that a define is not possible.
-  void DisableNativeWidgetMus();
-
  protected:
   TestViewsDelegate* views_delegate() const {
     return test_helper_->views_delegate();
   }
 
   void set_views_delegate(std::unique_ptr<TestViewsDelegate> views_delegate) {
     DCHECK(!setup_called_);
     views_delegate_for_setup_.swap(views_delegate);
   }
 
@@ skipping 13 matching lines @@
 #if defined(OS_WIN)
   ui::ScopedOleInitializer ole_initializer_;
 #endif
 
   DISALLOW_COPY_AND_ASSIGN(ViewsTestBase);
 };
 
 }  // namespace views
 
 #endif  // UI_VIEWS_TEST_VIEWS_TEST_BASE_H_