GN: Do not use forward_dependent_configs_from variable.

webrtc/modules/audio_coding/BUILD.gn

Index: webrtc/modules/audio_coding/BUILD.gn
diff --git a/webrtc/modules/audio_coding/BUILD.gn b/webrtc/modules/audio_coding/BUILD.gn
index b1d8cebdec84fda9bac57d72d9e73a0829d15f97..7bbcd3aee2d40eaccdfbdafb6cae6daba9731e8a 100644
--- a/webrtc/modules/audio_coding/BUILD.gn
+++ b/webrtc/modules/audio_coding/BUILD.gn
@@ -709,8 +709,9 @@ source_set("webrtc_opus") {
     configs += [ "../..:common_config" ]
     public_configs = [ "../..:common_inherited_config" ]
 
-    deps += [ rtc_opus_dir ]
-    forward_dependent_configs_from = [ rtc_opus_dir ]
+    public_deps = [
+      rtc_opus_dir,
+    ]
   } else if (build_with_mozilla) {
     include_dirs = [ getenv("DIST") + "/include/opus" ]
   }