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/rtc_base/message_queue.h b/rtc_base/message_queue.h
index e484561..5a6bd0a 100644
--- a/rtc_base/message_queue.h
+++ b/rtc_base/message_queue.h
@@ -19,11 +19,11 @@
 #include <queue>
 #include <vector>
 
+#include "api/scoped_refptr.h"
 #include "rtc_base/constructor_magic.h"
 #include "rtc_base/critical_section.h"
 #include "rtc_base/location.h"
 #include "rtc_base/message_handler.h"
-#include "rtc_base/scoped_ref_ptr.h"
 #include "rtc_base/socket_server.h"
 #include "rtc_base/third_party/sigslot/sigslot.h"
 #include "rtc_base/thread_annotations.h"