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

webrtc/engine_configurations.h

Index: webrtc/engine_configurations.h
diff --git a/webrtc/engine_configurations.h b/webrtc/engine_configurations.h
index f59fd3ec26b6c6a4c1a8bfe42dcdb6b1b3baa8ed..c832d9acb39ec0e79ac1ccbd7136fcb3e654a797 100644
--- a/webrtc/engine_configurations.h
+++ b/webrtc/engine_configurations.h
@@ -18,27 +18,6 @@
 // ============================================================================
 
 // ----------------------------------------------------------------------------
-//  [Voice] Codec settings
-// ----------------------------------------------------------------------------
-
-// iSAC and G722 are not included in the Mozilla build, but in all other builds.
-#ifndef WEBRTC_MOZILLA_BUILD
-#ifdef WEBRTC_ARCH_ARM
-#define WEBRTC_CODEC_ISACFX  // Fix-point iSAC implementation.
-#else
-#define WEBRTC_CODEC_ISAC  // Floating-point iSAC implementation (default).
-#endif  // WEBRTC_ARCH_ARM
-#define WEBRTC_CODEC_G722
-#endif  // !WEBRTC_MOZILLA_BUILD
-
-// iLBC and Redundancy coding are excluded from Chromium and Mozilla
-// builds to reduce binary size.
-#if !defined(WEBRTC_CHROMIUM_BUILD) && !defined(WEBRTC_MOZILLA_BUILD)
-#define WEBRTC_CODEC_ILBC
-#define WEBRTC_CODEC_RED
-#endif  // !WEBRTC_CHROMIUM_BUILD && !WEBRTC_MOZILLA_BUILD
-
-// ----------------------------------------------------------------------------
 //  [Video] Codec settings
 // ----------------------------------------------------------------------------