Fix deadlock in VideoSendStream tests, cause of flake on some bots.

Bug: webrtc:10861, webrtc:10880
Change-Id: Ic3ff9fab420e1fd634f58ef86d2f8890e23cfd03
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/150220
Commit-Queue: Tommi <tommi@webrtc.org>
Reviewed-by: Yves Gerey <yvesg@google.com>
Reviewed-by: Sami Kalliomäki <sakal@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#28969}
diff --git a/video/BUILD.gn b/video/BUILD.gn
index 634e40e..2e4cde2 100644
--- a/video/BUILD.gn
+++ b/video/BUILD.gn
@@ -623,6 +623,7 @@
       "../rtc_base:rtc_task_queue",
       "../rtc_base:task_queue_for_test",
       "../rtc_base/experiments:alr_experiment",
+      "../rtc_base/synchronization:sequence_checker",
       "../rtc_base/task_utils:to_queued_task",
       "../system_wrappers",
       "../system_wrappers:field_trial",