Move sync notifier contruction out of syncer thread.

chrome/browser/sync/engine/syncapi.h

Index: chrome/browser/sync/engine/syncapi.h
diff --git a/chrome/browser/sync/engine/syncapi.h b/chrome/browser/sync/engine/syncapi.h
index 241411c054a7d389698a74c3871fa5769c7a9201..fa55add425081eed99501623f04242781780398e 100644
--- a/chrome/browser/sync/engine/syncapi.h
+++ b/chrome/browser/sync/engine/syncapi.h
@@ -846,8 +846,7 @@ class SyncManager {
   // |model_safe_worker| ownership is given to the SyncManager.
   // |user_agent| is a 7-bit ASCII string suitable for use as the User-Agent
   // HTTP header. Used internally when collecting stats to classify clients.
-  // |sync_notifier| will be owned internally and used to listen for
-  // notifications.
+  // |sync_notifier| used to listen for notifications, not owned.
   bool Init(const FilePath& database_location,
             const char* sync_server_and_path,
             int sync_server_port,