Clean up ExoPlayerLibraryInfo

PiperOrigin-RevId: 401729859

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

@@ -15,12 +15,11 @@
  */
 package com.google.android.exoplayer2;
 
-import android.os.Build;
 import com.google.android.exoplayer2.util.Assertions;
 import com.google.android.exoplayer2.util.TraceUtil;
 import java.util.HashSet;
 
-/** Information about the ExoPlayer library. */
+/** Information about the library. */
 public final class ExoPlayerLibraryInfo {
 
   /** A tag to use when logging library information. */
@@ -44,15 +43,6 @@ public final class ExoPlayerLibraryInfo {
   // Intentionally hardcoded. Do not derive from other constants (e.g. VERSION) or vice versa.
   public static final int VERSION_INT = 2015001;
 
-  /**
-   * The default user agent for requests made by the library.
-   *
-   * @deprecated ExoPlayer now uses the user agent of the underlying network stack by default.
-   */
-  @Deprecated
-  public static final String DEFAULT_USER_AGENT =
-      VERSION_SLASHY + " (Linux; Android " + Build.VERSION.RELEASE + ") " + VERSION_SLASHY;
-
   /** Whether the library was compiled with {@link Assertions} checks enabled. */
   public static final boolean ASSERTIONS_ENABLED = true;