Implement lossy pref behavior for JsonPrefStore.

chrome/browser/sxs_linux.cc

Index: chrome/browser/sxs_linux.cc
diff --git a/chrome/browser/sxs_linux.cc b/chrome/browser/sxs_linux.cc
index 040011dc24cdb6de6094dc6d1edf4a6f9052a586..d19e3187688100f23f162c170d318b9f8e4e13fd 100644
--- a/chrome/browser/sxs_linux.cc
+++ b/chrome/browser/sxs_linux.cc
@@ -79,9 +79,8 @@ bool DoAddChannelMarkToUserDataDir(const base::FilePath& user_data_dir) {
   }
 
   user_data_dir_channels.push_back(product_channel_name);
-  return base::ImportantFileWriter::WriteFileAtomically(
-      channels_path,
-      JoinString(user_data_dir_channels, "\n"));
+  return base::ImportantFileWriterImpl::WriteFileAtomically(
+      channels_path, JoinString(user_data_dir_channels, "\n"));
 }
 
 }  // namespace