Move AudioDecoder and related stuff to the api/ directory

webrtc/modules/utility/BUILD.gn

 # Copyright (c) 2014 The WebRTC project authors. All Rights Reserved.
 #
 # Use of this source code is governed by a BSD-style license
 # that can be found in the LICENSE file in the root of the source
 # tree. An additional intellectual property rights grant can be found
 # in the file PATENTS.  All contributing project authors may
 # be found in the AUTHORS file in the root of the source tree.
 
 import("../../webrtc.gni")
 
@@ skipping 17 matching lines @@
   if (is_ios) {
     libs = [ "AVFoundation.framework" ]
   }
 
   deps = [
     "../..:webrtc_common",
     "../../audio/utility:audio_frame_operations",
     "../../base:rtc_task_queue",
     "../../common_audio",
     "../../system_wrappers",
-    "../audio_coding",
-    "../audio_coding:audio_format_conversion",
-    "../audio_coding:builtin_audio_decoder_factory",
-    "../audio_coding:rent_a_codec",
     "../media_file",
   ]
 }
 
 if (rtc_include_tests) {
   rtc_source_set("utility_unittests") {
     testonly = true
     sources = [
       "source/process_thread_impl_unittest.cc",
     ]
     deps = [
       ":utility",
       "../../base:rtc_task_queue",
       "../../test:test_support",
       "//testing/gmock",
     ]
   }
 }