Add audio_format_conversion to deps for audio_decoder_factory_interface.

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 bbf4668627a1345e21d16ede496b96a26a19c90c..f6188a0425742dcbbb67b60190aebcc6f135dc14 100644
--- a/webrtc/modules/audio_coding/BUILD.gn
+++ b/webrtc/modules/audio_coding/BUILD.gn
@@ -68,6 +68,10 @@ rtc_source_set("audio_decoder_factory_interface") {
   deps = [
     ":audio_decoder_interface",
     ":audio_format",
+
+    # TODO(charujain): Clean this dependency when downstream projects are
+    # updated to properly depend on audio_format_conversion target.
+    ":audio_format_conversion",
     "../../base:rtc_base_approved",
   ]
 }