Remove C.StreamType constant that's not a real stream type

#minor-release

PiperOrigin-RevId: 341833274

library/common/src/main/java/com/google/android/exoplayer2/C.java

@@ -254,8 +254,7 @@ public final class C {
   /**
    * Stream types for an {@link android.media.AudioTrack}. One of {@link #STREAM_TYPE_ALARM}, {@link
    * #STREAM_TYPE_DTMF}, {@link #STREAM_TYPE_MUSIC}, {@link #STREAM_TYPE_NOTIFICATION}, {@link
-   * #STREAM_TYPE_RING}, {@link #STREAM_TYPE_SYSTEM}, {@link #STREAM_TYPE_VOICE_CALL} or {@link
-   * #STREAM_TYPE_USE_DEFAULT}.
+   * #STREAM_TYPE_RING}, {@link #STREAM_TYPE_SYSTEM} or {@link #STREAM_TYPE_VOICE_CALL}.
    */
   @Documented
   @Retention(RetentionPolicy.SOURCE)
@@ -266,8 +265,7 @@ public final class C {
     STREAM_TYPE_NOTIFICATION,
     STREAM_TYPE_RING,
     STREAM_TYPE_SYSTEM,
-    STREAM_TYPE_VOICE_CALL,
-    STREAM_TYPE_USE_DEFAULT
+    STREAM_TYPE_VOICE_CALL
   })
   public @interface StreamType {}
   /**
@@ -298,13 +296,7 @@ public final class C {
    * @see AudioManager#STREAM_VOICE_CALL
    */
   public static final int STREAM_TYPE_VOICE_CALL = AudioManager.STREAM_VOICE_CALL;
-  /**
-   * @see AudioManager#USE_DEFAULT_STREAM_TYPE
-   */
-  public static final int STREAM_TYPE_USE_DEFAULT = AudioManager.USE_DEFAULT_STREAM_TYPE;
-  /**
-   * The default stream type used by audio renderers.
-   */
+  /** The default stream type used by audio renderers. Equal to {@link #STREAM_TYPE_MUSIC}. */
   public static final int STREAM_TYPE_DEFAULT = STREAM_TYPE_MUSIC;
 
   /**

library/common/src/main/java/com/google/android/exoplayer2/util/Util.java

@@ -1692,7 +1692,6 @@ public final class Util {
         return C.USAGE_ASSISTANCE_SONIFICATION;
       case C.STREAM_TYPE_VOICE_CALL:
         return C.USAGE_VOICE_COMMUNICATION;
-      case C.STREAM_TYPE_USE_DEFAULT:
       case C.STREAM_TYPE_MUSIC:
       default:
         return C.USAGE_MEDIA;
@@ -1713,7 +1712,6 @@ public final class Util {
         return C.CONTENT_TYPE_SONIFICATION;
       case C.STREAM_TYPE_VOICE_CALL:
         return C.CONTENT_TYPE_SPEECH;
-      case C.STREAM_TYPE_USE_DEFAULT:
       case C.STREAM_TYPE_MUSIC:
       default:
         return C.CONTENT_TYPE_MUSIC;