Implement lossy pref behavior for JsonPrefStore.

chrome/browser/safe_browsing/incident_reporting/download_metadata_manager.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/safe_browsing/incident_reporting/download_metadata_manager.h"
 
 #include <list>
 
 #include "base/bind.h"
 #include "base/callback.h"
@@ skipping 90 matching lines @@
   UMA_HISTOGRAM_ENUMERATION(
       "SBIRS.DownloadMetadata.ReadResult", result, NUM_READ_RESULTS);
 }
 
 // Writes |download_metadata| to |metadata_path|.
 void WriteMetadataOnWorkerPool(const base::FilePath& metadata_path,
                                DownloadMetadata* download_metadata) {
   MetadataWriteResult result = NUM_WRITE_RESULTS;
   std::string file_data;
   if (download_metadata->SerializeToString(&file_data)) {
-    result =
-        base::ImportantFileWriter::WriteFileAtomically(metadata_path, file_data)
-            ? WRITE_SUCCESS
-            : WRITE_FAILURE;
+    result = base::ImportantFileWriterImpl::WriteFileAtomically(metadata_path,
+                                                                file_data)
+                 ? WRITE_SUCCESS
+                 : WRITE_FAILURE;
   } else {
     result = SERIALIZATION_FAILURE;
   }
   UMA_HISTOGRAM_ENUMERATION(
       "SBIRS.DownloadMetadata.WriteResult", result, NUM_WRITE_RESULTS);
 }
 
 // Deletes |metadata_path|.
 void DeleteMetadataOnWorkerPool(const base::FilePath& metadata_path) {
   bool success = base::DeleteFile(metadata_path, false /* not recursive */);
@@ skipping 497 matching lines @@
 
 void DownloadMetadataManager::ManagerContext::WriteMetadata() {
   write_runner_->PostTask(
       FROM_HERE,
       base::Bind(&WriteMetadataOnWorkerPool,
                  metadata_path_,
                  base::Owned(new DownloadMetadata(*download_metadata_))));
 }
 
 }  // namespace safe_browsing