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

chrome/browser/safe_json_parser_browsertest.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 "base/bind.h"
 #include "base/json/json_reader.h"
 #include "base/json/json_writer.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/values.h"
 #include "chrome/browser/safe_json_parser.h"
 #include "chrome/test/base/in_process_browser_test.h"
 #include "content/public/test/test_browser_thread_bundle.h"
 #include "content/public/test/test_utils.h"
 
 namespace {
 
 std::string MaybeToJson(const base::Value* value) {
   if (!value)
     return "(null)";
 
   std::string json;
-  if (!base::JSONWriter::Write(value, &json))
+  if (!base::JSONWriter::Write(*value, &json))
     return "(invalid value)";
 
   return json;
 }
 
 }  // namespace
 
 class SafeJsonParserTest : public InProcessBrowserTest {
  protected:
   void TestParse(const std::string& json) {
@@ skipping 62 matching lines @@
   TestParse("\"laser\"");
   TestParse("false");
   TestParse("null");
   TestParse("3.14");
   TestParse("[");
   TestParse("\"");
   TestParse(std::string());
   TestParse("☃");
   TestParse("\"☃\"");
 }