Revert "Add Profile 2 configuration to VP9 Encoder and Decoder"

This reverts commit fc9c4e88b5569f0d2cd1c64cbc27fd969ce2db17.

Reason for revert: Speculative revert. I suspect this breaks the internal importing tests. Will reland it if it is not the culprit.

Original change's description:
> Add Profile 2 configuration to VP9 Encoder and Decoder
> 
> Bug: webrtc:9376
> Change-Id: I4f627fb2b6c146a90cfcaa815da459b09dc00003
> Reviewed-on: https://webrtc-review.googlesource.com/81980
> Commit-Queue: Emircan Uysaler <emircan@webrtc.org>
> Reviewed-by: Niklas Enbom <niklas.enbom@webrtc.org>
> Reviewed-by: Erik Språng <sprang@webrtc.org>
> Reviewed-by: Jerome Jiang <jianj@google.com>
> Cr-Commit-Position: refs/heads/master@{#23917}

TBR=niklase@google.com,jianj@google.com,sprang@webrtc.org,marpan@google.com,niklas.enbom@webrtc.org,emircan@webrtc.org

Change-Id: I6a8c851827707eb861776591087e595de7206ae4
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: webrtc:9376
Reviewed-on: https://webrtc-review.googlesource.com/88100
Reviewed-by: Qingsi Wang <qingsi@webrtc.org>
Commit-Queue: Qingsi Wang <qingsi@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#23920}

modules/video_coding/codecs/test/video_codec_unittest.cc

@@ -69,7 +69,8 @@ void VideoCodecUnitTest::SetUp() {
 
   input_frame_generator_ = test::FrameGenerator::CreateSquareGenerator(
       codec_settings_.width, codec_settings_.height,
-      test::FrameGenerator::OutputType::I420, absl::optional<int>());
+      absl::optional<test::FrameGenerator::OutputType>(),
+      absl::optional<int>());
 
   encoder_ = CreateEncoder();
   decoder_ = CreateDecoder();