Revert of Reland: mus: Add views_mus_interactive_ui_tests target

ui/views/test/platform_test_helper.cc

Index: ui/views/test/platform_test_helper.cc
diff --git a/ui/views/test/platform_test_helper.cc b/ui/views/test/platform_test_helper.cc
index 1d309ee25931b11829d15dacd8a0ca940a59056c..a415ff9ae860f1f5bca9635d2da8ac8a971a4507 100644
--- a/ui/views/test/platform_test_helper.cc
+++ b/ui/views/test/platform_test_helper.cc
@@ -17,12 +17,13 @@
 
   ~DefaultPlatformTestHelper() override {}
 
+  bool IsMus() const override { return false; }
+
  private:
   DISALLOW_COPY_AND_ASSIGN(DefaultPlatformTestHelper);
 };
 
 PlatformTestHelper::Factory test_helper_factory;
-bool is_mus = false;
 
 }  // namespace
 
@@ -38,14 +39,4 @@
              : base::WrapUnique(new DefaultPlatformTestHelper);
 }
 
-// static
-void PlatformTestHelper::SetIsMus() {
-  is_mus = true;
-}
-
-// static
-bool PlatformTestHelper::IsMus() {
-  return is_mus;
-}
-
 }  // namespace views