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}

modules/video_coding/encoded_frame.cc

@@ -43,7 +43,6 @@ void VCMEncodedFrame::Reset() {
   _frameType = VideoFrameType::kVideoFrameDelta;
   _encodedWidth = 0;
   _encodedHeight = 0;
-  _completeFrame = false;
   _missingFrame = false;
   set_size(0);
   _codecSpecificInfo.codecType = kVideoCodecGeneric;