Convert JsonWriter::Write to taking a const ref for the in-param

remoting/host/cast_extension_session.cc

Index: remoting/host/cast_extension_session.cc
diff --git a/remoting/host/cast_extension_session.cc b/remoting/host/cast_extension_session.cc
index 9bceaa6e40b444fc9645b6246fc8ba911b85d0b1..843a79d1585d959e63c3ec6308babfbda70c6750 100644
--- a/remoting/host/cast_extension_session.cc
+++ b/remoting/host/cast_extension_session.cc
@@ -202,15 +202,15 @@ void CastExtensionSession::OnCreateSessionDescription(
   peer_connection_->SetLocalDescription(
       CastSetSessionDescriptionObserver::Create(), desc);
 
-  scoped_ptr<base::DictionaryValue> json(new base::DictionaryValue());
-  json->SetString(kWebRtcSessionDescType, desc->type());
+  base::DictionaryValue json;
+  json.SetString(kWebRtcSessionDescType, desc->type());
   std::string subject =
       (desc->type() == "offer") ? kSubjectOffer : kSubjectAnswer;
   std::string desc_str;
   desc->ToString(&desc_str);
-  json->SetString(kWebRtcSessionDescSDP, desc_str);
+  json.SetString(kWebRtcSessionDescSDP, desc_str);
   std::string json_str;
-  if (!base::JSONWriter::Write(json.get(), &json_str)) {
+  if (!base::JSONWriter::Write(json, &json_str)) {
     LOG(ERROR) << "Failed to serialize sdp message.";
     return;
   }
@@ -420,7 +420,7 @@ bool CastExtensionSession::SendMessageToClient(const std::string& subject,
   message_dict.SetString(kTopLevelData, data);
   std::string message_json;
 
-  if (!base::JSONWriter::Write(&message_dict, &message_json)) {
+  if (!base::JSONWriter::Write(message_dict, &message_json)) {
     LOG(ERROR) << "Failed to serialize JSON message.";
     return false;
   }
@@ -647,12 +647,12 @@ void CastExtensionSession::OnIceCandidate(
     LOG(ERROR) << "PeerConnectionObserver: failed to serialize candidate.";
     return;
   }
-  scoped_ptr<base::DictionaryValue> json(new base::DictionaryValue());
-  json->SetString(kWebRtcSDPMid, candidate->sdp_mid());
-  json->SetInteger(kWebRtcSDPMLineIndex, candidate->sdp_mline_index());
-  json->SetString(kWebRtcCandidate, candidate_str);
+  base::DictionaryValue json;
+  json.SetString(kWebRtcSDPMid, candidate->sdp_mid());
+  json.SetInteger(kWebRtcSDPMLineIndex, candidate->sdp_mline_index());
+  json.SetString(kWebRtcCandidate, candidate_str);
   std::string json_str;
-  if (!base::JSONWriter::Write(json.get(), &json_str)) {
+  if (!base::JSONWriter::Write(json, &json_str)) {
     LOG(ERROR) << "Failed to serialize candidate message.";
     return;
   }