Implement lossy pref behavior for JsonPrefStore.

chrome/browser/spellchecker/spellcheck_custom_dictionary.cc

 // Copyright (c) 2012 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/spellchecker/spellcheck_custom_dictionary.h"
 
 #include <functional>
 
 #include "base/files/file_util.h"
 #include "base/files/important_file_writer.h"
@@ skipping 102 matching lines @@
   DCHECK_CURRENTLY_ON(BrowserThread::FILE);
   std::stringstream content;
   for (WordList::const_iterator it = custom_words.begin();
        it != custom_words.end();
        ++it) {
     content << *it << '\n';
   }
   std::string checksum = base::MD5String(content.str());
   content << CHECKSUM_PREFIX << checksum;
   base::CopyFile(path, path.AddExtension(BACKUP_EXTENSION));
-  base::ImportantFileWriter::WriteFileAtomically(path, content.str());
+  base::ImportantFileWriterImpl::WriteFileAtomically(path, content.str());
 }
 
 // Removes duplicate and invalid words from |to_add| word list and sorts it.
 // Looks for duplicates in both |to_add| and |existing| word lists. Returns a
 // bitmap of |ChangeSanitationResult| values.
 int SanitizeWordsToAdd(const WordSet& existing, WordList& to_add) {
   // Do not add duplicate words.
   std::sort(to_add.begin(), to_add.end());
   WordList new_words = base::STLSetDifference<WordList>(to_add, existing);
   new_words.erase(std::unique(new_words.begin(), new_words.end()),
@@ skipping 393 matching lines @@
 
 void SpellcheckCustomDictionary::Notify(
     const SpellcheckCustomDictionary::Change& dictionary_change) {
   DCHECK_CURRENTLY_ON(BrowserThread::UI);
   if (!IsLoaded() || dictionary_change.empty())
     return;
   FOR_EACH_OBSERVER(Observer,
                     observers_,
                     OnCustomDictionaryChanged(dictionary_change));
 }