make new syncer thread the default.

chrome/browser/sync/sessions/sync_session_context.cc

-// Copyright (c) 2010 The Chromium Authors. All rights reserved.
+// 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/sessions/sync_session_context.h"
 
 #include "chrome/browser/sync/util/extensions_activity_monitor.h"
 #include "chrome/browser/sync/sessions/session_state.h"
 #include "content/browser/browser_thread.h"
 
 namespace browser_sync {
@@ skipping 17 matching lines @@
 }
 
 SyncSessionContext::~SyncSessionContext() {
   // In unittests, there may be no UI thread, so the above will fail.
   if (!BrowserThread::DeleteSoon(BrowserThread::UI, FROM_HERE,
                                 extensions_activity_monitor_)) {
     delete extensions_activity_monitor_;
   }
 }
 
-void SyncSessionContext::set_last_snapshot(
-    const SyncSessionSnapshot& snapshot) {
-  previous_session_snapshot_.reset(new SyncSessionSnapshot(snapshot));
-}
-
 }  // namespace sessions
 }  // namespace browser_sync