Don't select audio codecs depending on GN vars `build_with_{chromium|mozilla}`

BUG=webrtc:8343

Change-Id: I5943006a4da17f72eb88eae9d7ea57574d54f680
Reviewed-on: https://webrtc-review.googlesource.com/9401
Commit-Queue: Karl Wiberg <kwiberg@webrtc.org>
Reviewed-by: Oskar Sundbom <ossu@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#20540}
diff --git a/modules/audio_coding/BUILD.gn b/modules/audio_coding/BUILD.gn
index 941f13c..e5854ef 100644
--- a/modules/audio_coding/BUILD.gn
+++ b/modules/audio_coding/BUILD.gn
@@ -22,14 +22,12 @@
 if (rtc_include_opus) {
   audio_codec_deps += [ ":webrtc_opus" ]
 }
-if (!build_with_mozilla) {
-  if (current_cpu == "arm") {
-    audio_codec_deps += [ ":isac_fix" ]
-  } else {
-    audio_codec_deps += [ ":isac" ]
-  }
-  audio_codec_deps += [ ":g722" ]
+if (current_cpu == "arm") {
+  audio_codec_deps += [ ":isac_fix" ]
+} else {
+  audio_codec_deps += [ ":isac" ]
 }
+audio_codec_deps += [ ":g722" ]
 if (!build_with_mozilla && !build_with_chromium) {
   audio_codec_deps += [ ":red" ]
 }