Revert "Fix issue 2459650."

This reverts commit 699f7ce33d715f49a89f584034436b85e9d7a6e7.
diff --git a/media/libmedia/AudioSystem.cpp b/media/libmedia/AudioSystem.cpp
index 1787e1f..5352234 100644
--- a/media/libmedia/AudioSystem.cpp
+++ b/media/libmedia/AudioSystem.cpp
@@ -694,9 +694,7 @@
 
 bool AudioSystem::isLowVisibility(stream_type stream)
 {
-    if (stream == AudioSystem::SYSTEM ||
-        stream == AudioSystem::NOTIFICATION ||
-        stream == AudioSystem::RING) {
+    if (stream == AudioSystem::SYSTEM || stream == AudioSystem::NOTIFICATION) {
         return true;
     } else {
         return false;