Remove references to IsNewAvatarMenu since the flag was removed.

components/signin/core/common/profile_management_switches.h

Index: components/signin/core/common/profile_management_switches.h
diff --git a/components/signin/core/common/profile_management_switches.h b/components/signin/core/common/profile_management_switches.h
index c1ad76134e6979cf4ec58b6028e51619c3ff6d4d..9ef7ab64caf262f5b5eb1edbef14647378366f19 100644
--- a/components/signin/core/common/profile_management_switches.h
+++ b/components/signin/core/common/profile_management_switches.h
@@ -28,20 +28,13 @@ bool IsExtensionsMultiAccount();
 // Enables using GAIA information to populate profile name and icon.
 bool IsGoogleProfileInfo();
 
-// Whether the new avatar menu is enabled, either because new profile management
-// is enabled or because the new profile management preview UI is enabled.
-bool IsNewAvatarMenu();
-
 // Use new profile management system, including profile sign-out and new
 // choosers.
 bool IsNewProfileManagement();
 
 // Whether the new profile management preview has been enabled.
 bool IsNewProfileManagementPreviewEnabled();
-
 // Called in tests to force enabling different modes.
-void EnableNewAvatarMenuForTesting(base::CommandLine* command_line);
-void DisableNewAvatarMenuForTesting(base::CommandLine* command_line);
 void EnableNewProfileManagementForTesting(base::CommandLine* command_line);
 void EnableAccountConsistencyForTesting(base::CommandLine* command_line);