[Sync] use base::Time in sync

chrome/browser/sync/glue/session_change_processor.cc

 // Copyright (c) 2011 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/glue/session_change_processor.h"
 
 #include <sstream>
 #include <string>
 #include <vector>
 
@@ skipping 226 matching lines @@
     if (specifics.session_tag() ==
             session_model_associator_->GetCurrentMachineTag() &&
         !setup_for_test_) {
       // We should only ever receive a change to our own machine's session info
       // if encryption was turned on. In that case, the data is still the same,
       // so we can ignore.
       LOG(WARNING) << "Dropping modification to local session.";
       StartObserving();
       return;
     }
-    const int64 mtime = sync_node.GetModificationTime();
+    const base::Time& mtime = sync_node.GetModificationTime();
     // Model associator handles foreign session update and add the same.
     session_model_associator_->AssociateForeignSpecifics(specifics, mtime);
   }
 
   // Notify foreign session handlers that there are new sessions.
   NotificationService::current()->Notify(
       chrome::NOTIFICATION_FOREIGN_SESSION_UPDATED,
       NotificationService::AllSources(),
       NotificationService::NoDetails());
 
@@ skipping 37 matching lines @@
       NotificationService::AllBrowserContextsAndSources());
 }
 
 void SessionChangeProcessor::StopObserving() {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
   DCHECK(profile_);
   notification_registrar_.RemoveAll();
 }
 
 }  // namespace browser_sync