Build https://codereview.webrtc.org/1368843003/ as if with firefox

webrtc/modules/audio_coding/BUILD.gn

Index: webrtc/modules/audio_coding/BUILD.gn
diff --git a/webrtc/modules/audio_coding/BUILD.gn b/webrtc/modules/audio_coding/BUILD.gn
index 1ad194c98f20718536ff96453026ca4e1e7f5ae0..eecb0e19d109d4b48825be6b9945fe52a7bf062f 100644
--- a/webrtc/modules/audio_coding/BUILD.gn
+++ b/webrtc/modules/audio_coding/BUILD.gn
@@ -79,17 +79,6 @@ source_set("audio_coding") {
     defines += [ "WEBRTC_CODEC_OPUS" ]
     deps += [ ":webrtc_opus" ]
   }
-  if (!build_with_mozilla) {
-    if (current_cpu == "arm") {
-      defines += [ "WEBRTC_CODEC_ISACFX" ]
-      deps += [ ":isac_fix" ]
-    } else {
-      defines += [ "WEBRTC_CODEC_ISAC" ]
-      deps += [ ":isac" ]
-    }
-    defines += [ "WEBRTC_CODEC_G722" ]
-    deps += [ ":g722" ]
-  }
 }
 
 source_set("audio_decoder_interface") {
@@ -807,15 +796,4 @@ source_set("neteq") {
     defines += [ "WEBRTC_CODEC_OPUS" ]
     deps += [ ":webrtc_opus" ]
   }
-  if (!build_with_mozilla) {
-    if (current_cpu == "arm") {
-      defines += [ "WEBRTC_CODEC_ISACFX" ]
-      deps += [ ":isac_fix" ]
-    } else {
-      defines += [ "WEBRTC_CODEC_ISAC" ]
-      deps += [ ":isac" ]
-    }
-    defines += [ "WEBRTC_CODEC_G722" ]
-    deps += [ ":g722" ]
-  }
 }