Fix Chrome hang when user login with force-sign-in enabled on Mac

Two functions do not call the assoicated Cocoa suffix properly.
It causes an infinity loop in the end.

Here is the original CL:
https://chromium.googlesource.com/chromium/src/+/007bca68b8905abeac9519c0809d039fc47f73a8

Please note that the CL above has been checked into M66. It was not caught by the QA
team as the code was disabled by the feature switcher.

Bug: 835758
Change-Id: I60f38199049fcf07f1767680f4287349152f1360
Reviewed-on: https://chromium-review.googlesource.com/1025047Reviewed-by: Elly Fong-Jones <ellyjones@chromium.org>
Commit-Queue: Owen Min <zmin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#553092}

chrome/browser/ui/views/profiles/user_manager_view.cc

@@ -252,7 +252,7 @@ void UserManager::AddOnUserManagerShownCallbackForTesting(
 base::FilePath UserManager::GetSigninProfilePath() {
 #if defined(OS_MACOSX)
   if (views_mode_controller::IsViewsBrowserCocoa()) {
-    return UserManager::GetSigninProfilePath();
+    return UserManager::GetSigninProfilePathCocoa();
   }
 #endif
 
@@ -341,7 +341,7 @@ void UserManagerProfileDialog::ShowDialogAndDisplayErrorMessage(
 void UserManagerProfileDialog::DisplayErrorMessage() {
 #if defined(OS_MACOSX)
   if (views_mode_controller::IsViewsBrowserCocoa()) {
-    return UserManagerProfileDialog::DisplayErrorMessage();
+    return UserManagerProfileDialog::DisplayErrorMessageCocoa();
   }
 #endif