Add wildcard visibility to video_replay to make it buildable in Chromium.

Bug: chromium:942546
Change-Id: Ib798b58e854a2471ab1bb94725cb0ee2b04b84da
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/168320
Reviewed-by: Mirko Bonadei <mbonadei@webrtc.org>
Commit-Queue: Max Moroz <mmoroz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#30477}

video/BUILD.gn

@@ -248,6 +248,7 @@ if (!is_component_build) {
   # is_component_build=true because it depends on WebRTC testonly code
   # which is not part of //third_party/webrtc_overrides:webrtc_component.
   rtc_executable("video_replay") {
+    visibility = [ "*" ]
     testonly = true
     sources = [ "video_replay.cc" ]
     deps = [