Removes code using mus client lib

ui/views/test/platform_test_helper.h

Index: ui/views/test/platform_test_helper.h
diff --git a/ui/views/test/platform_test_helper.h b/ui/views/test/platform_test_helper.h
index 909191befd08aa1d42e72d29aee97471e759f72a..fb3ab103da6bd0d6cf054fac5c8449950336b183 100644
--- a/ui/views/test/platform_test_helper.h
+++ b/ui/views/test/platform_test_helper.h
@@ -24,14 +24,9 @@ class PlatformTestHelper {
   static void set_factory(const Factory& factory);
   static std::unique_ptr<PlatformTestHelper> Create();
 
-  // Whether we are running under the mus environment. Methods are static so
-  // that they can be called before Create().
   static void SetIsMus();
   static bool IsMus();
 
-  static void SetIsAuraMusClient();
-  static bool IsAuraMusClient();
-
   // Called once the ViewsTestHelper has been created, but before SetUp() is
   // called.
   virtual void OnTestHelperCreated(ViewsTestHelper* helper) {}