Add GROUP_FILE ModelSafeGroup

chrome/browser/sync/glue/sync_backend_registrar.cc

Index: chrome/browser/sync/glue/sync_backend_registrar.cc
diff --git a/chrome/browser/sync/glue/sync_backend_registrar.cc b/chrome/browser/sync/glue/sync_backend_registrar.cc
index 376ab5bf64013845112511cab0eec7c1d3b769c5..ca67f05ab19218efc5ecb0e2509bed498dce17ea 100644
--- a/chrome/browser/sync/glue/sync_backend_registrar.cc
+++ b/chrome/browser/sync/glue/sync_backend_registrar.cc
@@ -12,6 +12,7 @@
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/sync/glue/change_processor.h"
 #include "chrome/browser/sync/glue/database_model_worker.h"
+#include "chrome/browser/sync/glue/file_model_worker.h"
 #include "chrome/browser/sync/glue/history_model_worker.h"
 #include "chrome/browser/sync/glue/password_model_worker.h"
 #include "chrome/browser/sync/glue/ui_model_worker.h"
@@ -31,6 +32,8 @@ bool IsOnThreadForGroup(ModelSafeGroup group) {
       return BrowserThread::CurrentlyOn(BrowserThread::UI);
     case GROUP_DB:
       return BrowserThread::CurrentlyOn(BrowserThread::DB);
+    case GROUP_FILE:
+      return BrowserThread::CurrentlyOn(BrowserThread::FILE);
     case GROUP_HISTORY:
       // TODO(ncarter): How to determine this?
       return true;
@@ -58,6 +61,7 @@ SyncBackendRegistrar::SyncBackendRegistrar(
   CHECK(profile_);
   DCHECK(sync_loop_);
   workers_[GROUP_DB] = new DatabaseModelWorker();
+  workers_[GROUP_FILE] = new FileModelWorker();
   workers_[GROUP_UI] = ui_worker_;
   workers_[GROUP_PASSIVE] = new ModelSafeWorker();