Remove unused dependency on APM in audio mixer

Bug: webrtc:11226
Change-Id: I5e4ac0a8b790c97cf6f1e9db2515d05afdf1fff2
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/170322
Reviewed-by: Per Ã…hgren <peah@webrtc.org>
Reviewed-by: Mirko Bonadei <mbonadei@webrtc.org>
Commit-Queue: Sam Zackrisson <saza@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#30887}
diff --git a/modules/audio_mixer/BUILD.gn b/modules/audio_mixer/BUILD.gn
index 6afd004..a4b71f6 100644
--- a/modules/audio_mixer/BUILD.gn
+++ b/modules/audio_mixer/BUILD.gn
@@ -29,7 +29,8 @@
 
   public = [
     "audio_mixer_impl.h",
-    "default_output_rate_calculator.h",  # For creating a mixer with limiter disabled.
+    "default_output_rate_calculator.h",  # For creating a mixer with limiter
+                                         # disabled.
     "frame_combiner.h",
   ]
 
@@ -47,7 +48,6 @@
     "../../rtc_base:rtc_base_approved",
     "../../system_wrappers",
     "../../system_wrappers:metrics",
-    "../audio_processing",
     "../audio_processing:api",
     "../audio_processing:apm_logging",
     "../audio_processing:audio_frame_view",