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

chrome/browser/local_discovery/privetv3_session.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/local_discovery/privetv3_session.h"
 
 #include "base/base64.h"
 #include "base/json/json_writer.h"
 #include "base/logging.h"
 #include "base/message_loop/message_loop.h"
@@ skipping 392 matching lines @@
   CreateFetcher(api, net::URLFetcher::RequestType::GET, callback)->Start();
 }
 
 void PrivetV3Session::StartPostRequest(const std::string& api,
                                        const base::DictionaryValue& input,
                                        const MessageCallback& callback) {
   if (!on_post_data_.is_null())
     on_post_data_.Run(input);
   std::string json;
   base::JSONWriter::WriteWithOptions(
-      &input, base::JSONWriter::OPTIONS_PRETTY_PRINT, &json);
+      input, base::JSONWriter::OPTIONS_PRETTY_PRINT, &json);
   PrivetURLFetcher* fetcher =
       CreateFetcher(api, net::URLFetcher::RequestType::POST, callback);
   fetcher->SetUploadData(cloud_print::kContentTypeJSON, json);
   fetcher->Start();
 }
 
 PrivetURLFetcher* PrivetV3Session::CreateFetcher(
     const std::string& api,
     net::URLFetcher::RequestType request_type,
     const MessageCallback& callback) {
@@ skipping 14 matching lines @@
 void PrivetV3Session::Cancel() {
   // Cancel started unconfirmed sessions.
   if (session_id_.empty() || !fingerprint_.empty())
     return;
   base::DictionaryValue input;
   input.SetString(kPrivetV3KeySessionId, session_id_);
   StartPostRequest(kPrivetV3PairingCancelPath, input, MessageCallback());
 }
 
 }  // namespace local_discovery