Prepare for injectable SW decoders

webrtc/media/engine/videodecodersoftwarefallbackwrapper.cc

Index: webrtc/media/engine/videodecodersoftwarefallbackwrapper.cc
diff --git a/webrtc/media/engine/videodecodersoftwarefallbackwrapper.cc b/webrtc/media/engine/videodecodersoftwarefallbackwrapper.cc
index 6a234d54de0d1e068d12684f38e0ad2e8162ec8c..0e7632ba1406e89f0214afed9633ed7c4d5a11e4 100644
--- a/webrtc/media/engine/videodecodersoftwarefallbackwrapper.cc
+++ b/webrtc/media/engine/videodecodersoftwarefallbackwrapper.cc
@@ -22,9 +22,9 @@ namespace webrtc {
 
 VideoDecoderSoftwareFallbackWrapper::VideoDecoderSoftwareFallbackWrapper(
     VideoCodecType codec_type,
-    VideoDecoder* decoder)
+    std::unique_ptr<VideoDecoder> decoder)
     : codec_type_(codec_type),
-      decoder_(decoder),
+      decoder_(std::move(decoder)),
       decoder_initialized_(false),
       callback_(nullptr) {}