Injectable audio encoders: Moved audio encoder, factory and builtin factory to api/.

webrtc/test/BUILD.gn

Index: webrtc/test/BUILD.gn
diff --git a/webrtc/test/BUILD.gn b/webrtc/test/BUILD.gn
index c696979dd11105b7c4aed5bc81b74c28fca2978f..77e940659d150a0dff2f81a02f266cc9aa1762c0 100644
--- a/webrtc/test/BUILD.gn
+++ b/webrtc/test/BUILD.gn
@@ -412,11 +412,11 @@ rtc_source_set("test_common") {
     ":test_support",
     ":video_test_common",
     "..:webrtc_common",
+    "../api/audio_codecs:builtin_audio_encoder_factory",
     "../api/video_codecs:video_codecs_api",
     "../audio",
     "../base:rtc_base_approved",
     "../call",
-    "../modules/audio_coding:builtin_audio_encoder_factory",
     "../modules/audio_mixer:audio_mixer_impl",
     "../modules/audio_processing",
     "../video",
@@ -505,5 +505,13 @@ rtc_source_set("audio_codec_mocks") {
   sources = [
     "mock_audio_decoder.h",
     "mock_audio_decoder_factory.h",
+    "mock_audio_encoder.cc",
+    "mock_audio_encoder.h",
+    "mock_audio_encoder_factory.h",
+  ]
+
+  deps = [
+    "../api/audio_codecs:audio_codecs_api",
+    "//testing/gmock",
   ]
 }