Delete I420 encoder and decoder.

PRESUBMIT.py

 # Copyright (c) 2012 The WebRTC project authors. All Rights Reserved.
 #
 # Use of this source code is governed by a BSD-style license
 # that can be found in the LICENSE file in the root of the source
 # tree. An additional intellectual property rights grant can be found
 # in the file PATENTS.  All contributing project authors may
 # be found in the AUTHORS file in the root of the source tree.
 
 import json
 import os
@@ skipping 50 matching lines @@
   'webrtc/modules/audio_device/include',
   'webrtc/modules/audio_processing/include',
   'webrtc/modules/bitrate_controller/include',
   'webrtc/modules/congestion_controller/include',
   'webrtc/modules/include',
   'webrtc/modules/remote_bitrate_estimator/include',
   'webrtc/modules/rtp_rtcp/include',
   'webrtc/modules/rtp_rtcp/source',  # DEPRECATED.
   'webrtc/modules/utility/include',
   'webrtc/modules/video_coding/codecs/h264/include',
-  'webrtc/modules/video_coding/codecs/i420/include',
   'webrtc/modules/video_coding/codecs/vp8/include',
   'webrtc/modules/video_coding/codecs/vp9/include',
   'webrtc/modules/video_coding/include',
   'webrtc/system_wrappers/include',  # DEPRECATED.
   'webrtc/voice_engine/include',
 )
 
 
 def _VerifyNativeApiHeadersListIsValid(input_api, output_api):
   """Ensures the list of native API header directories is up to date."""
@@ skipping 432 matching lines @@
     for builder in masters[master]:
       if 'presubmit' in builder:
         # Do not trigger presubmit builders, since they're likely to fail
         # (e.g. OWNERS checks before finished code review), and we're running
         # local presubmit anyway.
         pass
       else:
         try_config[master][builder] = ['defaulttests']
 
   return try_config