Remove webrtc::VideoDecoder::PrefersLateDecoding.

This is just general cleanup.

The assumed behavior is late decoding, and this function is not used to make any decision (except in the deprecated jitter buffer).

Bug: webrtc:12271
Change-Id: Ifb48186d55903f068f25e44c5f73e7a724f6f456
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/200804
Commit-Queue: Philip Eliasson <philipel@webrtc.org>
Reviewed-by: Sami Kalliomäki <sakal@webrtc.org>
Reviewed-by: Christoffer Rodbro <crodbro@webrtc.org>
Reviewed-by: Erik Språng <sprang@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#32940}

sdk/android/api/org/webrtc/VideoDecoder.java

@@ -90,7 +90,10 @@ public interface VideoDecoder {
    * The decoder should return true if it prefers late decoding. That is, it can not decode
    * infinite number of frames before the decoded frame is consumed.
    */
-  @CalledByNative boolean getPrefersLateDecoding();
+  // TODO(bugs.webrtc.org/12271): Remove when downstream has been updated.
+  default boolean getPrefersLateDecoding() {
+    return true;
+  }
   /**
    * Should return a descriptive name for the implementation. Gets called once and cached. May be
    * called from arbitrary thread.