[Sync] Split DirectoryChangeListener for thread-safety

chrome/browser/sync/engine/verify_updates_command.cc

 // Copyright (c) 2010 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/sync/engine/verify_updates_command.h"
 
+#include "base/tracked.h"
 #include "chrome/browser/sync/engine/syncer.h"
 #include "chrome/browser/sync/engine/syncer_proto_util.h"
 #include "chrome/browser/sync/engine/syncer_types.h"
 #include "chrome/browser/sync/engine/syncer_util.h"
 #include "chrome/browser/sync/engine/syncproto.h"
 #include "chrome/browser/sync/protocol/bookmark_specifics.pb.h"
 #include "chrome/browser/sync/syncable/directory_manager.h"
 #include "chrome/browser/sync/syncable/syncable.h"
 
 namespace browser_sync {
@@ skipping 10 matching lines @@
 
 void VerifyUpdatesCommand::ModelChangingExecuteImpl(
     sessions::SyncSession* session) {
   VLOG(1) << "Beginning Update Verification";
   ScopedDirLookup dir(session->context()->directory_manager(),
                       session->context()->account_name());
   if (!dir.good()) {
     LOG(ERROR) << "Scoped dir lookup failed!";
     return;
   }
-  WriteTransaction trans(dir, SYNCER, __FILE__, __LINE__);
+  WriteTransaction trans(dir, SYNCER, FROM_HERE);
   sessions::StatusController* status = session->status_controller();
   const GetUpdatesResponse& updates = status->updates_response().get_updates();
   int update_count = updates.entries().size();
 
   VLOG(1) << update_count << " entries to verify";
   for (int i = 0; i < update_count; i++) {
     const SyncEntity& update =
         *reinterpret_cast<const SyncEntity *>(&(updates.entries(i)));
     ModelSafeGroup g = GetGroupForModelType(update.GetModelType(),
                                             session->routing_info());
@@ skipping 70 matching lines @@
         deleted, is_directory, model_type);
   }
 
   if (VERIFY_UNDECIDED == result.value)
     result.value = VERIFY_SUCCESS;  // No news is good news.
 
   return result;  // This might be VERIFY_SUCCESS as well
 }
 
 }  // namespace browser_sync