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/tests/src/org/webrtc/HardwareVideoEncoderTest.java

@@ -233,7 +233,6 @@ public class HardwareVideoEncoderTest {
     assertThat(videoFrame.encodedHeight).isEqualTo(TEST_ENCODER_SETTINGS.height);
     assertThat(videoFrame.rotation).isEqualTo(0);
     assertThat(videoFrame.captureTimeNs).isEqualTo(42);
-    assertThat(videoFrame.completeFrame).isTrue();
     assertThat(videoFrame.frameType).isEqualTo(FrameType.VideoFrameKey);
     CodecTestHelper.assertEqualContents(
         outputData, videoFrame.buffer, /* offset= */ 0, videoFrame.buffer.capacity());