Add dependency on new webrtc target api:rtp_parameters

Intended to enable landing of
https://webrtc-review.googlesource.com/c/src/+/53861

Bug: webrtc:8733
Change-Id: Ia0b946c51215fc7ce6f7f27541d1e788cda1a843
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1768587Reviewed-by: Philip Jägenstedt <foolip@chromium.org>
Commit-Queue: Niels Möller <nisse@chromium.org>
Cr-Commit-Position: refs/heads/master@{#691086}

third_party/blink/public/BUILD.gn

@@ -548,6 +548,7 @@ source_set("blink_headers") {
     "//third_party/blink/renderer/platform/wtf:wtf",
     "//third_party/webrtc/api:libjingle_peerconnection_api",
     "//third_party/webrtc/api:rtc_stats_api",
+    "//third_party/webrtc/api:rtp_parameters",
     "//third_party/webrtc/api:scoped_refptr",
     "//third_party/webrtc/api/audio_codecs:audio_codecs_api",
     "//third_party/webrtc/api/video:video_frame",