Remove references to IsNewAvatarMenu since the flag was removed.

chrome/browser/ui/webui/signin/user_manager_ui_browsertest.cc

Index: chrome/browser/ui/webui/signin/user_manager_ui_browsertest.cc
diff --git a/chrome/browser/ui/webui/signin/user_manager_ui_browsertest.cc b/chrome/browser/ui/webui/signin/user_manager_ui_browsertest.cc
index f7c648244f07f07368150a03dfcbb828e9d32454..f46c3e4928df5b9ecbe6cf9ed6385168fe7b77e5 100644
--- a/chrome/browser/ui/webui/signin/user_manager_ui_browsertest.cc
+++ b/chrome/browser/ui/webui/signin/user_manager_ui_browsertest.cc
@@ -26,16 +26,6 @@ class UserManagerUIBrowserTest : public InProcessBrowserTest,
                                  public testing::WithParamInterface<bool> {
  public:
   UserManagerUIBrowserTest() {}
-
- protected:
-  void SetUp() override {
-    InProcessBrowserTest::SetUp();
-    DCHECK(switches::IsNewAvatarMenu());
-  }
-
-  void SetUpCommandLine(base::CommandLine* command_line) override {
-    switches::EnableNewAvatarMenuForTesting(command_line);
-  }
 };
 
 IN_PROC_BROWSER_TEST_F(UserManagerUIBrowserTest, PageLoads) {