Replace scoped_ptr with unique_ptr in talk/

talk/app/webrtc/objc/RTCPeerConnectionInterface.mm

Index: talk/app/webrtc/objc/RTCPeerConnectionInterface.mm
diff --git a/talk/app/webrtc/objc/RTCPeerConnectionInterface.mm b/talk/app/webrtc/objc/RTCPeerConnectionInterface.mm
index 8cbb5883516dadb664578c27ff4cd30a983c91e0..0d8c3aec5237b12a813283d683a800b7147b1809 100644
--- a/talk/app/webrtc/objc/RTCPeerConnectionInterface.mm
+++ b/talk/app/webrtc/objc/RTCPeerConnectionInterface.mm
@@ -31,6 +31,8 @@
 #import "talk/app/webrtc/objc/RTCICEServer+Internal.h"
 #import "talk/app/webrtc/objc/public/RTCLogging.h"
 
+#include <memory>
+
 @implementation RTCConfiguration
 
 @synthesize iceTransportsType = _iceTransportsType;
@@ -95,11 +97,12 @@
   nativeConfig.ice_connection_receiving_timeout = _iceConnectionReceivingTimeout;
   nativeConfig.ice_backup_candidate_pair_ping_interval = _iceBackupCandidatePairPingInterval;
   if (_keyType == kRTCEncryptionKeyTypeECDSA) {
-    rtc::scoped_ptr<rtc::SSLIdentity> identity(
+    std::unique_ptr<rtc::SSLIdentity> identity(
         rtc::SSLIdentity::Generate(webrtc::kIdentityName, rtc::KT_ECDSA));
     if (identity) {
       nativeConfig.certificates.push_back(
-          rtc::RTCCertificate::Create(std::move(identity)));
+          rtc::RTCCertificate::Create(
+              rtc::UniqueToScoped(std::move(identity))));
     } else {
       RTCLogWarning(@"Failed to generate ECDSA identity. RSA will be used.");
     }