Replace scoped_ptr with unique_ptr in webrtc/base/

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 0d8c3aec5237b12a813283d683a800b7147b1809..7cc10e9d85bf81bffcda25118e668db62089bd14 100644
--- a/talk/app/webrtc/objc/RTCPeerConnectionInterface.mm
+++ b/talk/app/webrtc/objc/RTCPeerConnectionInterface.mm
@@ -101,8 +101,7 @@
         rtc::SSLIdentity::Generate(webrtc::kIdentityName, rtc::KT_ECDSA));
     if (identity) {
       nativeConfig.certificates.push_back(
-          rtc::RTCCertificate::Create(
-              rtc::UniqueToScoped(std::move(identity))));
+          rtc::RTCCertificate::Create(std::move(identity)));
     } else {
       RTCLogWarning(@"Failed to generate ECDSA identity. RSA will be used.");
     }