[iOS] Add missing dependency for EG2 test

The Signin test were missing the dependency for the the app interface
for EG2, leading to "unrecognized selector" error when running the test.

Bug: none
Change-Id: Iee424c0ca4a09472a7ccdadfff60aaf8381903b8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1985001
Commit-Queue: Gauthier Ambard <gambard@chromium.org>
Commit-Queue: Jérôme Lebel <jlebel@chromium.org>
Auto-Submit: Gauthier Ambard <gambard@chromium.org>
Reviewed-by: Jérôme Lebel <jlebel@chromium.org>
Cr-Commit-Position: refs/heads/master@{#727873}

ios/chrome/test/earl_grey/BUILD.gn

@@ -420,6 +420,7 @@ source_set("eg_app_support+eg2") {
     "//ios/chrome/browser/ui/settings/clear_browsing_data",
     "//ios/chrome/browser/ui/settings/credit_card_scanner",
     "//ios/chrome/browser/ui/settings/google_services:constants",
+    "//ios/chrome/browser/ui/settings/google_services:eg_app_support+eg2",
     "//ios/chrome/browser/ui/settings/password:eg_app_support+eg2",
     "//ios/chrome/browser/ui/settings/password:password_constants",
     "//ios/chrome/browser/ui/settings/sync",