Re-enabling 'gn check' on //examples/*.

Bug: webrtc:8850
Change-Id: I7397bc17e0f790a31d417d1bf5db6c5f9e32088d
No-Presubmit: true
Reviewed-on: https://webrtc-review.googlesource.com/54314
Commit-Queue: Mirko Bonadei <mbonadei@webrtc.org>
Reviewed-by: Patrik Höglund <phoglund@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#22085}
diff --git a/.gn b/.gn
index 5937b34..9d95808 100644
--- a/.gn
+++ b/.gn
@@ -28,9 +28,7 @@
   "//call/*",
   "//common_audio/*",
   "//common_video/*",
-
-  # TODO(bugs.webrtc.org/8850): re-enable when 'gn check' will be fixed.
-  # "//examples/*",
+  "//examples/*",
   "//logging/*",
   "//media/*",
   "//modules/*",