Mirror syncfs log to console and WebUI, with LogSeverity support.

chrome/browser/sync_file_system/drive_file_sync_util.cc

Index: chrome/browser/sync_file_system/drive_file_sync_util.cc
diff --git a/chrome/browser/sync_file_system/drive_file_sync_util.cc b/chrome/browser/sync_file_system/drive_file_sync_util.cc
index abd2998b9d55fd2aa13867d50ce7584aebb154f9..cb10383cf3ac39fc151c63851c00416d03670e3e 100644
--- a/chrome/browser/sync_file_system/drive_file_sync_util.cc
+++ b/chrome/browser/sync_file_system/drive_file_sync_util.cc
@@ -6,6 +6,7 @@
 
 #include "base/command_line.h"
 #include "base/logging.h"
+#include "chrome/browser/sync_file_system/logger.h"
 
 namespace sync_file_system {
 
@@ -77,7 +78,7 @@ SyncStatusCode GDataErrorCodeToSyncStatusCode(
   if (error == -1)
     return SYNC_STATUS_NETWORK_ERROR;
 
-  LOG(WARNING) << "Got unexpected error: " << error;
+  SYNCFS_LOG(WARNING, "Got unexpected error: %d", static_cast<int>(error));
   return SYNC_STATUS_FAILED;
 }