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/WrappedNativeVideoDecoder.java

@@ -31,11 +31,6 @@ public abstract class WrappedNativeVideoDecoder implements VideoDecoder {
     throw new UnsupportedOperationException("Not implemented.");
   }
 
-  @Override
-  public final boolean getPrefersLateDecoding() {
-    throw new UnsupportedOperationException("Not implemented.");
-  }
-
   @Override
   public final String getImplementationName() {
     throw new UnsupportedOperationException("Not implemented.");