Removed _completeFrame since we never allow incomplete frames.

In the old jitter buffer the two VCMVideoProtection modes |kProtectionNone| and |kProtectionFEC| could be set on the jitter buffer for it to not wait for NACK and instead generate incomplete frames. This has not been possible for a long time.

Bug: webrtc:9378, webrtc:7408
Change-Id: I0a2d3ec34d721126c1128306d5fad88314f8d59f
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/190680
Reviewed-by: Kári Helgason <kthelgason@webrtc.org>
Reviewed-by: Sami Kalliomäki <sakal@webrtc.org>
Reviewed-by: Niels Moller <nisse@webrtc.org>
Commit-Queue: Philip Eliasson <philipel@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#32513}

sdk/android/src/java/org/webrtc/AndroidVideoDecoder.java

@@ -246,10 +246,6 @@ class AndroidVideoDecoder implements VideoDecoder, VideoSink {
         Logging.e(TAG, "decode() - key frame required first");
         return VideoCodecStatus.NO_OUTPUT;
       }
-      if (!frame.completeFrame) {
-        Logging.e(TAG, "decode() - complete frame required first");
-        return VideoCodecStatus.NO_OUTPUT;
-      }
     }
 
     int index;