Delete unneeded dependency on webrtc media_file/

Bug: none
Change-Id: I995b5edbce2969313424fc71ef6dc240c268dd24
Reviewed-on: https://chromium-review.googlesource.com/885806Reviewed-by: Henrik Grunell <grunell@chromium.org>
Commit-Queue: Niels Möller <nisse@chromium.org>
Cr-Commit-Position: refs/heads/master@{#532381}

third_party/webrtc_overrides/BUILD.gn

@@ -131,7 +131,6 @@ source_set("libjingle_webrtc_common") {
     "//third_party/usrsctp",
     "//third_party/webrtc/media:rtc_media",
     "//third_party/webrtc/media:rtc_media_base",
-    "//third_party/webrtc/modules/media_file",
     "//third_party/webrtc/modules/video_capture",
     "//third_party/webrtc/pc:libjingle_peerconnection",
     "//third_party/webrtc/pc:rtc_pc",