Delete OptionsFile class. Refactored only user, TurnFileAuth.

Bug: webrtc:6424
Change-Id: I4b74cd6197f2cb060d1aff70e3adadbdf7f7a580
Reviewed-on: https://webrtc-review.googlesource.com/c/108122
Commit-Queue: Niels Moller <nisse@webrtc.org>
Reviewed-by: Patrik Höglund <phoglund@webrtc.org>
Reviewed-by: Karl Wiberg <kwiberg@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#25426}
diff --git a/BUILD.gn b/BUILD.gn
index 1be75d3..3a89edc 100644
--- a/BUILD.gn
+++ b/BUILD.gn
@@ -47,6 +47,7 @@
         "call:fake_network_unittests",
         "common_audio:common_audio_unittests",
         "common_video:common_video_unittests",
+        "examples:examples_unittests",
         "media:rtc_media_unittests",
         "modules:modules_tests",
         "modules:modules_unittests",