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

chrome/browser/extensions/api/webrtc_logging_private/webrtc_logging_private_apitest.cc

 // Copyright 2013 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 "base/json/json_writer.h"
 #include "base/strings/string_split.h"
 #include "chrome/browser/browser_process.h"
 #include "chrome/browser/extensions/api/webrtc_logging_private/webrtc_logging_private_api.h"
 #include "chrome/browser/extensions/extension_apitest.h"
 #include "chrome/browser/extensions/extension_function_test_utils.h"
@@ skipping 17 matching lines @@
 
 namespace utils = extension_function_test_utils;
 
 namespace {
 
 static const char kTestLoggingSessionId[] = "0123456789abcdef";
 static const char kTestLoggingUrl[] = "dummy url string";
 
 std::string ParamsToString(const base::ListValue& parameters) {
   std::string parameter_string;
-  EXPECT_TRUE(base::JSONWriter::Write(&parameters, &parameter_string));
+  EXPECT_TRUE(base::JSONWriter::Write(parameters, &parameter_string));
   return parameter_string;
 }
 
 void InitializeTestMetaData(base::ListValue* parameters) {
   base::DictionaryValue* meta_data_entry = new base::DictionaryValue();
   meta_data_entry->SetString("key", "app_session_id");
   meta_data_entry->SetString("value", kTestLoggingSessionId);
   base::ListValue* meta_data = new base::ListValue();
   meta_data->Append(meta_data_entry);
   meta_data_entry = new base::DictionaryValue();
@@ skipping 337 matching lines @@
   ASSERT_TRUE(StoreLog(kLogId));
 
   ScopedOverrideUploadBuffer buffer_override;
   EXPECT_TRUE(UploadStoredLog(kLogId));
   EXPECT_NE(std::string::npos,
             buffer_override.multipart().find("filename=\"webrtc_log.gz\""));
   EXPECT_NE(std::string::npos,
             buffer_override.multipart().find(kTestLoggingUrl));
 }