Delete old include file webrtc/video_frame.h.

webrtc/BUILD.gn

Index: webrtc/BUILD.gn
diff --git a/webrtc/BUILD.gn b/webrtc/BUILD.gn
index 766d3d4636ebf4f7471d9f8ca782617b823b3c11..9904ee15c7977047ad0c0575cbc0e20bff6f376b 100644
--- a/webrtc/BUILD.gn
+++ b/webrtc/BUILD.gn
@@ -237,20 +237,6 @@ rtc_source_set("video_stream_api") {
   ]
 }
 
-# Contents of video_frame.h is moved from top-level down to common_video/.
-# Nothing in webrtc includes the backwards-compatibility header, so this target
-# is only for completeness.
-# TODO(nisse): Delete together with the header file once downstream applications
-# no longer use it.
-rtc_source_set("video_frame_deprecated") {
-  sources = [
-    "video_frame.h",
-  ]
-  deps = [
-    "common_video",
-  ]
-}
-
 if (!build_with_chromium) {
   # Target to build all the WebRTC production code.
   rtc_static_library("webrtc") {