Let VideoEncoderSoftwareFallbackWrapper own the wrapped encoder

webrtc/media/engine/videoencodersoftwarefallbackwrapper.cc

 /*
  *  Copyright (c) 2016 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.
  */
 
@@ skipping 51 matching lines @@
     return;
   }
   *param_low_kbps = low_kbps;
   *param_high_kbps = high_kbps;
   *param_min_low_ms = min_low_ms;
 }
 }  // namespace
 
 VideoEncoderSoftwareFallbackWrapper::VideoEncoderSoftwareFallbackWrapper(
     const cricket::VideoCodec& codec,
-    webrtc::VideoEncoder* encoder)
+    std::unique_ptr<webrtc::VideoEncoder> encoder)
     : number_of_cores_(0),
       max_payload_size_(0),
       rates_set_(false),
       framerate_(0),
       channel_parameters_set_(false),
       packet_loss_(0),
       rtt_(0),
       codec_(codec),
-      encoder_(encoder),
+      encoder_(std::move(encoder)),
       callback_(nullptr),
       forced_fallback_possible_(EnableForcedFallback(codec)) {
   if (forced_fallback_possible_) {
     GetForcedFallbackParamsFromFieldTrialGroup(&forced_fallback_.low_kbps,
                                                &forced_fallback_.high_kbps,
                                                &forced_fallback_.min_low_ms);
   }
 }
 
 bool VideoEncoderSoftwareFallbackWrapper::InitFallbackEncoder() {
@@ skipping 271 matching lines @@
 void VideoEncoderSoftwareFallbackWrapper::MaybeModifyCodecForFallback() {
   // We have a specific case for H264 ConstrainedBaseline because that is the
   // only supported profile in Sw fallback.
   if (!cricket::CodecNamesEq(codec_.name.c_str(), cricket::kH264CodecName))
     return;
   codec_.SetParam(cricket::kH264FmtpProfileLevelId,
                   cricket::kH264ProfileLevelConstrainedBaseline);
 }
 
 }  // namespace webrtc