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

chrome/browser/chromeos/file_manager/url_util_unittest.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 "chrome/browser/chromeos/file_manager/url_util.h"
 
 #include "base/files/file_path.h"
 #include "base/json/json_reader.h"
 #include "base/json/json_writer.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/strings/utf_string_conversions.h"
 #include "base/values.h"
 #include "net/base/escape.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace file_manager {
 namespace util {
 namespace {
 
 // Pretty print the JSON escaped in the query string.
 std::string PrettyPrintEscapedJson(const std::string& query) {
   const std::string json = net::UnescapeURLComponent(
       query, net::UnescapeRule::SPACES | net::UnescapeRule::URL_SPECIAL_CHARS);
   scoped_ptr<base::Value> value(base::JSONReader::Read(json));
   std::string pretty_json;
-  base::JSONWriter::WriteWithOptions(value.get(),
-                                     base::JSONWriter::OPTIONS_PRETTY_PRINT,
-                                     &pretty_json);
+  base::JSONWriter::WriteWithOptions(
+      *value, base::JSONWriter::OPTIONS_PRETTY_PRINT, &pretty_json);
   return pretty_json;
 }
 
 TEST(FileManagerUrlUtilTest, GetFileManagerMainPageUrl) {
   EXPECT_EQ("chrome-extension://hhaomjibdihmijegdhdafkllkbggdgoj/main.html",
             GetFileManagerMainPageUrl().spec());
 }
 
 TEST(FileManagerUrlUtilTest, GetFileManagerMainPageUrlWithParams_NoFileTypes) {
   const GURL url = GetFileManagerMainPageUrlWithParams(
@@ skipping 80 matching lines @@
             "      \"extensions\": [ \"txt\" ],\n"
             "      \"selected\": false\n"
             "   } ]\n"
             "}\n",
             PrettyPrintEscapedJson(url.query()));
 }
 
 }  // namespace
 }  // namespace util
 }  // namespace file_manager