Move functionality out from AudioFrame and into AudioFrameOperations.

webrtc/modules/audio_mixer/BUILD.gn

Index: webrtc/modules/audio_mixer/BUILD.gn
diff --git a/webrtc/modules/audio_mixer/BUILD.gn b/webrtc/modules/audio_mixer/BUILD.gn
index addffdd9f42da109bd1b0fecf945ce57c6b5fc4c..b30c69b2860765e4e4b4e67970184a24f2c65ecb 100644
--- a/webrtc/modules/audio_mixer/BUILD.gn
+++ b/webrtc/modules/audio_mixer/BUILD.gn
@@ -32,10 +32,10 @@ rtc_static_library("audio_mixer_impl") {
   deps = [
     ":audio_frame_manipulator",
     "../..:webrtc_common",
+    "../../audio/utility:audio_frame_operations",
     "../../base:rtc_base_approved",
-    "../../modules/audio_processing",
-    "../../modules/utility",
     "../../system_wrappers",
+    "../audio_processing",
   ]
 }
 
@@ -51,7 +51,7 @@ rtc_static_library("audio_frame_manipulator") {
   ]
 
   deps = [
+    "../../audio/utility",
     "../../base:rtc_base_approved",
-    "../../modules/utility",
   ]
 }