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

extensions/browser/computed_hashes.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 "extensions/browser/computed_hashes.h"
 
 #include "base/base64.h"
 #include "base/files/file_path.h"
 #include "base/files/file_util.h"
 #include "base/json/json_reader.h"
@@ skipping 138 matching lines @@
     block_hashes->AppendString(encoded);
   }
 }
 
 bool ComputedHashes::Writer::WriteToFile(const base::FilePath& path) {
   std::string json;
   base::DictionaryValue top_dictionary;
   top_dictionary.SetInteger(kVersionKey, kVersion);
   top_dictionary.Set(kFileHashesKey, file_list_.release());
 
-  if (!base::JSONWriter::Write(&top_dictionary, &json))
+  if (!base::JSONWriter::Write(top_dictionary, &json))
     return false;
   int written = base::WriteFile(path, json.data(), json.size());
   if (static_cast<unsigned>(written) != json.size()) {
     LOG(ERROR) << "Error writing " << path.AsUTF8Unsafe()
                << " ; write result:" << written << " expected:" << json.size();
     return false;
   }
   return true;
 }
 
@@ skipping 18 matching lines @@
 
     // If |contents| is empty, then we want to just exit here.
     if (bytes_to_read == 0)
       break;
 
     offset += bytes_to_read;
   } while (offset < contents.size());
 }
 
 }  // namespace extensions