Fix Chromium GN build problem introduced in 608c3cfe

R=henrikg@webrtc.org

Review URL: https://codereview.webrtc.org/1314593002 .

Cr-Commit-Position: refs/heads/master@{#9766}
diff --git a/webrtc/modules/audio_coding/BUILD.gn b/webrtc/modules/audio_coding/BUILD.gn
index d98d9c3..00e3aa7 100644
--- a/webrtc/modules/audio_coding/BUILD.gn
+++ b/webrtc/modules/audio_coding/BUILD.gn
@@ -387,6 +387,7 @@
     "codecs/isac/locked_bandwidth_info.cc",
     "codecs/isac/locked_bandwidth_info.h",
   ]
+  public_configs = [ "../..:common_inherited_config" ]
 }
 
 config("isac_config") {