Removes code using mus client lib

ui/views/test/views_test_base.cc

Index: ui/views/test/views_test_base.cc
diff --git a/ui/views/test/views_test_base.cc b/ui/views/test/views_test_base.cc
index d1cd2daf8b3d8a4364b4a27e5ea95534f2f86fa5..4147f01be0a5c8901a3669dd45e8cbd74ce14c3d 100644
--- a/ui/views/test/views_test_base.cc
+++ b/ui/views/test/views_test_base.cc
@@ -64,11 +64,6 @@ bool ViewsTestBase::IsMus() {
   return PlatformTestHelper::IsMus();
 }
 
-// static
-bool ViewsTestBase::IsAuraMusClient() {
-  return PlatformTestHelper::IsAuraMusClient();
-}
-
 void ViewsTestBase::SetUp() {
   testing::Test::SetUp();
   // ContentTestSuiteBase might have already initialized