Don't link with audio codecs that we don't use

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

 /*
  *  Copyright (c) 2015 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.
  */
 
 #ifndef WEBRTC_MODULES_AUDIO_CODING_MAIN_ACM2_CODEC_OWNER_H_
 #define WEBRTC_MODULES_AUDIO_CODING_MAIN_ACM2_CODEC_OWNER_H_
 
 #include "webrtc/base/constructormagic.h"
 #include "webrtc/base/scoped_ptr.h"
 #include "webrtc/common_types.h"
 #include "webrtc/modules/audio_coding/codecs/audio_encoder.h"
-#include "webrtc/modules/audio_coding/codecs/isac/main/interface/audio_encoder_isac.h"
+#include "webrtc/modules/audio_coding/codecs/audio_decoder.h"
 #include "webrtc/modules/audio_coding/main/interface/audio_coding_module_typedefs.h"
 
+#if defined(WEBRTC_CODEC_ISAC) || defined(WEBRTC_CODEC_ISACFX)
+#include "webrtc/modules/audio_coding/codecs/isac/locked_bandwidth_info.h"
+#else
+// Dummy implementation, for when we don't have iSAC.
 namespace webrtc {
+class LockedIsacBandwidthInfo {};
+}
+#endif
 
-class AudioDecoder;
-
+namespace webrtc {
 namespace acm2 {
 
 class CodecOwner {
  public:
   CodecOwner();
   ~CodecOwner();
 
   // Start using the specified encoder. Returns false on error.
   // TODO(kwiberg): Don't handle errors here (bug 5033)
   bool SetEncoders(const CodecInst& speech_inst,
@@ skipping 36 matching lines @@
   // are active.
   rtc::scoped_ptr<AudioEncoder> cng_encoder_;
   rtc::scoped_ptr<AudioEncoder> red_encoder_;
 
   RTC_DISALLOW_COPY_AND_ASSIGN(CodecOwner);
 };
 
 }  // namespace acm2
 }  // namespace webrtc
 #endif  // WEBRTC_MODULES_AUDIO_CODING_MAIN_ACM2_CODEC_OWNER_H_