Revert of CodecOwner: Don't look at definitions for classes we don't link with

webrtc/modules/audio_coding/main/acm2/codec_owner.cc

Index: webrtc/modules/audio_coding/main/acm2/codec_owner.cc
diff --git a/webrtc/modules/audio_coding/main/acm2/codec_owner.cc b/webrtc/modules/audio_coding/main/acm2/codec_owner.cc
index 1fb702625af662d64717fc1c89e99f0228cf9409..66be85ff8e333f74668f0a9c7946bd386f282884 100644
--- a/webrtc/modules/audio_coding/main/acm2/codec_owner.cc
+++ b/webrtc/modules/audio_coding/main/acm2/codec_owner.cc
@@ -14,27 +14,15 @@
 #include "webrtc/engine_configurations.h"
 #include "webrtc/modules/audio_coding/codecs/cng/include/audio_encoder_cng.h"
 #include "webrtc/modules/audio_coding/codecs/g711/include/audio_encoder_pcm.h"
-#ifdef WEBRTC_CODEC_G722
 #include "webrtc/modules/audio_coding/codecs/g722/include/audio_encoder_g722.h"
-#endif
-#ifdef WEBRTC_CODEC_ILBC
 #include "webrtc/modules/audio_coding/codecs/ilbc/interface/audio_encoder_ilbc.h"
-#endif
-#ifdef WEBRTC_CODEC_ISACFX
 #include "webrtc/modules/audio_coding/codecs/isac/fix/interface/audio_decoder_isacfix.h"
 #include "webrtc/modules/audio_coding/codecs/isac/fix/interface/audio_encoder_isacfix.h"
-#endif
-#ifdef WEBRTC_CODEC_ISAC
 #include "webrtc/modules/audio_coding/codecs/isac/main/interface/audio_decoder_isac.h"
 #include "webrtc/modules/audio_coding/codecs/isac/main/interface/audio_encoder_isac.h"
-#endif
-#ifdef WEBRTC_CODEC_OPUS
 #include "webrtc/modules/audio_coding/codecs/opus/interface/audio_encoder_opus.h"
-#endif
 #include "webrtc/modules/audio_coding/codecs/pcm16b/include/audio_encoder_pcm16b.h"
-#ifdef WEBRTC_CODEC_RED
 #include "webrtc/modules/audio_coding/codecs/red/audio_encoder_copy_red.h"
-#endif
 
 namespace webrtc {
 namespace acm2 {