Remove rtc_base/scoped_ref_ptr.h.

The type rtc::scoped_refptr<T> is now part of api/. Please include it from
api/scoped_refptr.h.

More info: See: https://groups.google.com/forum/#!topic/discuss-webrtc/Mme2MSz4z4o.

Bug: webrtc:9887, webrtc:8205
No-Try: True
Change-Id: Ic6c7c81e226e59f12f7933e472f573ae097b55bf
Reviewed-on: https://webrtc-review.googlesource.com/c/119041
Commit-Queue: Mirko Bonadei <mbonadei@webrtc.org>
Reviewed-by: Karl Wiberg <kwiberg@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#26414}
diff --git a/p2p/base/dtls_transport_internal.h b/p2p/base/dtls_transport_internal.h
index 3054169..b9c399d 100644
--- a/p2p/base/dtls_transport_internal.h
+++ b/p2p/base/dtls_transport_internal.h
@@ -17,10 +17,10 @@
 #include <string>
 
 #include "api/crypto/crypto_options.h"
+#include "api/scoped_refptr.h"
 #include "p2p/base/ice_transport_internal.h"
 #include "p2p/base/packet_transport_internal.h"
 #include "rtc_base/constructor_magic.h"
-#include "rtc_base/scoped_ref_ptr.h"
 #include "rtc_base/ssl_certificate.h"
 #include "rtc_base/ssl_fingerprint.h"
 #include "rtc_base/ssl_stream_adapter.h"