[Sync] Made some sync session member functions const

chrome/browser/sync/engine/store_timestamps_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/store_timestamps_command.h"
 
 #include "chrome/browser/sync/sessions/status_controller.h"
 #include "chrome/browser/sync/sessions/sync_session.h"
 #include "chrome/browser/sync/syncable/directory_manager.h"
 #include "chrome/browser/sync/syncable/model_type.h"
 #include "chrome/browser/sync/syncable/syncable.h"
 
 namespace browser_sync {
 
 StoreTimestampsCommand::StoreTimestampsCommand() {}
 StoreTimestampsCommand::~StoreTimestampsCommand() {}
 
 void StoreTimestampsCommand::ExecuteImpl(sessions::SyncSession* session) {
   syncable::ScopedDirLookup dir(session->context()->directory_manager(),
                                 session->context()->account_name());
 
   if (!dir.good()) {
     LOG(ERROR) << "Scoped dir lookup failed!";
     return;
   }
 
   const GetUpdatesResponse& updates =
-      session->status_controller()->updates_response().get_updates();
+      session->status_controller().updates_response().get_updates();
 
-  sessions::StatusController* status = session->status_controller();
+  sessions::StatusController* status = session->mutable_status_controller();
 
   // Update the progress marker tokens from the server result.  If a marker
   // was omitted for any one type, that indicates no change from the previous
   // state.
   syncable::ModelTypeBitSet forward_progress_types;
   for (int i = 0; i < updates.new_progress_marker_size(); ++i) {
     syncable::ModelType model =
         syncable::GetModelTypeFromExtensionFieldNumber(
             updates.new_progress_marker(i).data_type_id());
     if (model == syncable::UNSPECIFIED || model == syncable::TOP_LEVEL_FOLDER) {
@@ skipping 12 matching lines @@
         << status->updates_request_types().to_string();
   }
   if (updates.has_changes_remaining()) {
     int64 changes_left = updates.changes_remaining();
     VLOG(1) << "Changes remaining: " << changes_left;
     status->set_num_server_changes_remaining(changes_left);
   }
 }
 
 }  // namespace browser_sync