Revert of mus: Add views_mus_interactive_ui_tests target

ui/views/test/views_test_base.h

Index: ui/views/test/views_test_base.h
diff --git a/ui/views/test/views_test_base.h b/ui/views/test/views_test_base.h
index a64662b2dcb3669d46691c1a26605bc39615907b..c1e5c942f6b72f0490687a2a99db27fd1431977a 100644
--- a/ui/views/test/views_test_base.h
+++ b/ui/views/test/views_test_base.h
@@ -29,9 +29,6 @@
   ViewsTestBase();
   ~ViewsTestBase() override;
 
-  // Whether the test is running under mus.
-  static bool IsMus();
-
   // testing::Test:
   void SetUp() override;
   void TearDown() override;
@@ -46,6 +43,7 @@
   // would use an ifdef, but for the time being we're not compiling differently,
   // so that a define is not possible.
   void DisableNativeWidgetMus();
+  bool IsMus() const;
 
  protected:
   TestViewsDelegate* views_delegate() const {