Reland: mus: Add views_mus_interactive_ui_tests target

ui/views/test/scoped_views_test_helper.h

 // 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.
 
 #ifndef UI_VIEWS_TEST_SCOPED_VIEWS_TEST_HELPER_H_
 #define UI_VIEWS_TEST_SCOPED_VIEWS_TEST_HELPER_H_
 
 #include <memory>
 
 #include "base/macros.h"
@@ skipping 21 matching lines @@
       std::unique_ptr<TestViewsDelegate> views_delegate);
 
   ~ScopedViewsTestHelper();
 
   // Returns the context for creating new windows. In Aura builds, this will be
   // the RootWindow. Everywhere else, null.
   gfx::NativeWindow GetContext();
 
   TestViewsDelegate* views_delegate() { return views_delegate_.get(); };
 
-  bool IsMus() const;
-
  private:
   std::unique_ptr<TestViewsDelegate> views_delegate_;
   std::unique_ptr<ViewsTestHelper> test_helper_;
   std::unique_ptr<PlatformTestHelper> platform_test_helper_;
 
   DISALLOW_COPY_AND_ASSIGN(ScopedViewsTestHelper);
 };
 
 }  // namespace views
 
 #endif  // UI_VIEWS_TEST_SCOPED_VIEWS_TEST_HELPER_H_