Delete unneeded includes of deprecated system_wrappers include files.

webrtc/modules/video_coding/generic_encoder.cc

 /*
 *  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.
 */
 
 #include "webrtc/modules/video_coding/generic_encoder.h"
 
 #include <vector>
 
 #include "webrtc/api/video/i420_buffer.h"
 #include "webrtc/base/checks.h"
 #include "webrtc/base/logging.h"
 #include "webrtc/base/trace_event.h"
 #include "webrtc/modules/video_coding/encoded_frame.h"
 #include "webrtc/modules/video_coding/media_optimization.h"
-#include "webrtc/system_wrappers/include/critical_section_wrapper.h"
 
 namespace webrtc {
 
 VCMGenericEncoder::VCMGenericEncoder(
     VideoEncoder* encoder,
     VCMEncodedFrameCallback* encoded_frame_callback,
     bool internal_source)
     : encoder_(encoder),
       vcm_encoded_frame_callback_(encoded_frame_callback),
       internal_source_(internal_source),
@@ skipping 135 matching lines @@
     media_opt_->UpdateWithEncodedData(encoded_image);
     if (internal_source_) {
       // Signal to encoder to drop next frame.
       result.drop_next_frame = media_opt_->DropFrame();
     }
   }
   return result;
 }
 
 }  // namespace webrtc