Remove remaining variables related to incomplete frames.

Bug: webrtc:9378, webrtc:7408
Change-Id: I5b26f09a2da13906b421d0bcf615e721b66d4ce7
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/190860
Reviewed-by: Sami Kalliomäki <sakal@webrtc.org>
Reviewed-by: Kári Helgason <kthelgason@webrtc.org>
Reviewed-by: Niels Moller <nisse@webrtc.org>
Commit-Queue: Philip Eliasson <philipel@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#32552}

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

@@ -370,7 +370,6 @@ class HardwareVideoEncoder implements VideoEncoder {
     int bufferSize = videoFrameBuffer.getHeight() * videoFrameBuffer.getWidth() * 3 / 2;
     EncodedImage.Builder builder = EncodedImage.builder()
                                        .setCaptureTimeNs(videoFrame.getTimestampNs())
-                                       .setCompleteFrame(true)
                                        .setEncodedWidth(videoFrame.getBuffer().getWidth())
                                        .setEncodedHeight(videoFrame.getBuffer().getHeight())
                                        .setRotation(videoFrame.getRotation());