Use base/scoped_ptr.h; system_wrappers/interface/scoped_ptr.h is going away

BUG=
R=andrew@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/36229004

Cr-Commit-Position: refs/heads/master@{#8517}
git-svn-id: http://webrtc.googlecode.com/svn/trunk@8517 4adac7df-926f-26a2-2b94-8c16560cd09d
diff --git a/webrtc/modules/video_coding/main/source/receiver.h b/webrtc/modules/video_coding/main/source/receiver.h
index 0e1f01a..b27e35c 100644
--- a/webrtc/modules/video_coding/main/source/receiver.h
+++ b/webrtc/modules/video_coding/main/source/receiver.h
@@ -90,7 +90,7 @@
   Clock* const clock_;
   VCMJitterBuffer jitter_buffer_;
   VCMTiming* timing_;
-  scoped_ptr<EventWrapper> render_wait_event_;
+  rtc::scoped_ptr<EventWrapper> render_wait_event_;
   VCMReceiverState state_;
   int max_video_delay_ms_;