[Sync] Made some sync session member functions const

chrome/browser/sync/engine/sync_scheduler.cc

Index: chrome/browser/sync/engine/sync_scheduler.cc
diff --git a/chrome/browser/sync/engine/sync_scheduler.cc b/chrome/browser/sync/engine/sync_scheduler.cc
index f4aa2a01a6438be05e67f573a11c7f0c005f4c19..dea4a18f6ddb10d7a8edeb8e3b16df323b279b1a 100644
--- a/chrome/browser/sync/engine/sync_scheduler.cc
+++ b/chrome/browser/sync/engine/sync_scheduler.cc
@@ -843,9 +843,9 @@ void SyncScheduler::ScheduleNextSync(const SyncSessionJob& old_job) {
   // forward progress was possible at this time (an error, such as an HTTP
   // 500, is likely to have occurred during commit).
   int num_server_changes_remaining =
-      old_job.session->status_controller()->num_server_changes_remaining();
+      old_job.session->status_controller().num_server_changes_remaining();
   size_t num_unsynced_handles =
-      old_job.session->status_controller()->unsynced_handles().size();
+      old_job.session->status_controller().unsynced_handles().size();
   const bool work_to_do =
       num_server_changes_remaining > 0 || num_unsynced_handles > 0;
   SVLOG(2) << "num server changes remaining: " << num_server_changes_remaining