Remove the boolean for the migration sticky.

This was only meant to be shown for a single release, M84.

Bug: b/155141919
Change-Id: If6a276c8b45ed6dda5905cd1ff148341233fdad9
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2245167Reviewed-by: dstockwell <dstockwell@chromium.org>
Commit-Queue: Rachel Carpenter <carpenterr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#779140}

chrome/browser/chromeos/web_applications/chrome_help_app_ui_delegate.cc

@@ -106,9 +106,4 @@ void ChromeHelpAppUIDelegate::PopulateLoadTimeData(
   source->AddInteger("userType", user_manager->GetActiveUser()->GetType());
   source->AddBoolean("isEphemeralUser",
                      user_manager->IsCurrentUserNonCryptohomeDataEphemeral());
-
-  // Hardcoding the version number of first 84 dev.
-  bool is_new_in_84 = profile->WasCreatedByVersionOrLater("84.0.4129.0");
-  // Show a notice that the app has changed to users that are not new.
-  source->AddBoolean("shouldShowMigrationNotice", !is_new_in_84);
 }