Replace scoped_ptr with unique_ptr in webrtc/base/

webrtc/base/rtccertificate.cc

Index: webrtc/base/rtccertificate.cc
diff --git a/webrtc/base/rtccertificate.cc b/webrtc/base/rtccertificate.cc
index 7b764bd72e66faa2a63afb49894f61414ca15d08..70959eea382b0e4a5b2336c5978fab441e21bdf7 100644
--- a/webrtc/base/rtccertificate.cc
+++ b/webrtc/base/rtccertificate.cc
@@ -8,6 +8,8 @@
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
+#include <memory>
+
 #include "webrtc/base/rtccertificate.h"
 
 #include "webrtc/base/checks.h"
@@ -15,7 +17,7 @@
 namespace rtc {
 
 scoped_refptr<RTCCertificate> RTCCertificate::Create(
-    scoped_ptr<SSLIdentity> identity) {
+    std::unique_ptr<SSLIdentity> identity) {
   return new RefCountedObject<RTCCertificate>(identity.release());
 }