Revert of 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 c832d9acb39ec0e79ac1ccbd7136fcb3e654a797..f59fd3ec26b6c6a4c1a8bfe42dcdb6b1b3baa8ed 100644
--- a/webrtc/engine_configurations.h
+++ b/webrtc/engine_configurations.h
@@ -16,6 +16,27 @@
 // ============================================================================
 //                              Voice and Video
 // ============================================================================
+
+// ----------------------------------------------------------------------------
+//  [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