[Sync] Refactor non-frontend DTC to handle new API properly.

chrome/browser/sync/glue/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/change_processor.h"
 #include "chrome/browser/profiles/profile.h"
 
 namespace browser_sync {
 
 ChangeProcessor::ChangeProcessor(UnrecoverableErrorHandler* error_handler)
@@ skipping 21 matching lines @@
   running_ = false;
 }
 
 bool ChangeProcessor::IsRunning() const {
   return running_;
 }
 
 // Not implemented by default.
 void ChangeProcessor::CommitChangesFromSyncModel() {}
 
-UnrecoverableErrorHandler* ChangeProcessor::error_handler() {
+UnrecoverableErrorHandler* ChangeProcessor::error_handler() const {
   return error_handler_;
 }
 
-sync_api::UserShare* ChangeProcessor::share_handle() {
+sync_api::UserShare* ChangeProcessor::share_handle() const {
   return share_handle_;
 }
 
 }  // namespace browser_sync