Move AudioCodingModuleImpl to anonymous namespace in audio_coding_module.cc

webrtc/modules/audio_coding/acm2/acm_receiver_unittest_oldapi.cc

Index: webrtc/modules/audio_coding/acm2/acm_receiver_unittest_oldapi.cc
diff --git a/webrtc/modules/audio_coding/acm2/acm_receiver_unittest_oldapi.cc b/webrtc/modules/audio_coding/acm2/acm_receiver_unittest_oldapi.cc
index 174fff799a6eb36dddb89bf7611b0d5cd9563d11..81a57da3fa895fb8026dd5d4fb3304524439657c 100644
--- a/webrtc/modules/audio_coding/acm2/acm_receiver_unittest_oldapi.cc
+++ b/webrtc/modules/audio_coding/acm2/acm_receiver_unittest_oldapi.cc
@@ -17,7 +17,6 @@
 #include "webrtc/base/checks.h"
 #include "webrtc/base/safe_conversions.h"
 #include "webrtc/modules/audio_coding/include/audio_coding_module.h"
-#include "webrtc/modules/audio_coding/acm2/audio_coding_module_impl.h"
 #include "webrtc/modules/audio_coding/codecs/builtin_audio_decoder_factory.h"
 #include "webrtc/modules/audio_coding/neteq/tools/rtp_generator.h"
 #include "webrtc/system_wrappers/include/clock.h"
@@ -67,7 +66,7 @@ class AcmReceiverTestOldApi : public AudioPacketizationCallback,
   ~AcmReceiverTestOldApi() {}
 
   void SetUp() override {
-    acm_.reset(new AudioCodingModuleImpl(config_));
+    acm_.reset(AudioCodingModule::Create(config_));
     receiver_.reset(new AcmReceiver(config_));
     ASSERT_TRUE(receiver_.get() != NULL);
     ASSERT_TRUE(acm_.get() != NULL);