Stop using public_deps in common_audio.

Bug: webrtc:8603
Change-Id: I315311977f2a75476a7028b8d3eaf3c98caf4178
Reviewed-on: https://webrtc-review.googlesource.com/47920
Reviewed-by: Karl Wiberg <kwiberg@webrtc.org>
Commit-Queue: Mirko Bonadei <mbonadei@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#21902}
diff --git a/audio/BUILD.gn b/audio/BUILD.gn
index 84cf6bc..f6a30ba 100644
--- a/audio/BUILD.gn
+++ b/audio/BUILD.gn
@@ -58,6 +58,7 @@
     "../call:call_interfaces",
     "../call:rtp_interfaces",
     "../common_audio",
+    "../common_audio:common_audio_c",
     "../logging:rtc_event_audio",
     "../logging:rtc_event_log_api",
     "../modules:module_api",