Clean up some files from rtc_audio_video target

No longer needed after
https://chromium-review.googlesource.com/c/chromium/src/+/857118

Bug: webrtc:7925
Change-Id: I24d41413452fe9cc3fd5bc87e670cb7096790f4e
Reviewed-on: https://webrtc-review.googlesource.com/38780
Reviewed-by: Magnus Jedvert <magjed@webrtc.org>
Commit-Queue: Anders Carlsson <andersc@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#21593}
diff --git a/media/BUILD.gn b/media/BUILD.gn
index 9baeb45..14ba7f6 100644
--- a/media/BUILD.gn
+++ b/media/BUILD.gn
@@ -239,11 +239,6 @@
     "engine/webrtcvideoengine.h",
     "engine/webrtcvoiceengine.cc",
     "engine/webrtcvoiceengine.h",
-
-    # TODO(bugs.webrtc.org/7925) Remove these when clients are updated
-    "engine/convert_legacy_video_factory.h",
-    "engine/webrtcvideodecoderfactory.h",
-    "engine/webrtcvideoencoderfactory.h",
   ]
 
   configs += [ ":rtc_media_warnings_config" ]