Switching some interfaces to use std::unique_ptr<>.

webrtc/pc/peerconnectionfactory.h

Index: webrtc/pc/peerconnectionfactory.h
diff --git a/webrtc/pc/peerconnectionfactory.h b/webrtc/pc/peerconnectionfactory.h
index 932821f6405abbd7462b0e9b438e3af04ce2f81d..f43e94393f8d69447004eb5056e700bad8d85bab 100644
--- a/webrtc/pc/peerconnectionfactory.h
+++ b/webrtc/pc/peerconnectionfactory.h
@@ -61,13 +61,13 @@ class PeerConnectionFactory : public PeerConnectionFactoryInterface {
       const MediaConstraintsInterface* constraints) override;
 
   virtual rtc::scoped_refptr<VideoTrackSourceInterface> CreateVideoSource(
-      cricket::VideoCapturer* capturer) override;
+      std::unique_ptr<cricket::VideoCapturer> capturer) override;
   // This version supports filtering on width, height and frame rate.
   // For the "constraints=null" case, use the version without constraints.
   // TODO(hta): Design a version without MediaConstraintsInterface.
   // https://bugs.chromium.org/p/webrtc/issues/detail?id=5617
   rtc::scoped_refptr<VideoTrackSourceInterface> CreateVideoSource(
-      cricket::VideoCapturer* capturer,
+      std::unique_ptr<cricket::VideoCapturer> capturer,
       const MediaConstraintsInterface* constraints) override;
 
   rtc::scoped_refptr<VideoTrackInterface> CreateVideoTrack(
@@ -118,7 +118,7 @@ class PeerConnectionFactory : public PeerConnectionFactoryInterface {
   virtual ~PeerConnectionFactory();
 
  private:
-  cricket::MediaEngineInterface* CreateMediaEngine_w();
+  std::unique_ptr<cricket::MediaEngineInterface> CreateMediaEngine_w();
 
   bool owns_ptrs_;
   bool wraps_current_thread_;