ObserverList::HasObserver now takes a const pointer.

chrome/browser/sync/profile_sync_service.cc

 // Copyright (c) 2012 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/profile_sync_service.h"
 
 #include <cstddef>
 #include <map>
 #include <vector>
 
@@ skipping 2420 matching lines @@
     }
     helper->OnReceivedNodesForTypes(type_vector, empty_results.Pass());
   } else {
     backend_->GetAllNodesForTypes(
         directory_types,
         base::Bind(&GetAllNodesRequestHelper::OnReceivedNodesForTypes, helper));
   }
 }
 
 bool ProfileSyncService::HasObserver(
-    ProfileSyncServiceBase::Observer* observer) const {
+    const ProfileSyncServiceBase::Observer* observer) const {
   return observers_.HasObserver(observer);
 }
 
 base::WeakPtr<syncer::JsController> ProfileSyncService::GetJsController() {
   return sync_js_controller_.AsWeakPtr();
 }
 
 void ProfileSyncService::SyncEvent(SyncEventCodes code) {
   UMA_HISTOGRAM_ENUMERATION("Sync.EventCodes", code, MAX_SYNC_EVENT_CODE);
 }
@@ skipping 277 matching lines @@
 base::Time ProfileSyncService::GetDeviceBackupTimeForTesting() const {
   return device_info_sync_service_->GetLocalDeviceBackupTime();
 }
 
 void ProfileSyncService::FlushDirectory() const {
   // backend_initialized_ implies backend_ isn't NULL and the manager exists.
   // If sync is not initialized yet, we fail silently.
   if (backend_initialized_)
     backend_->FlushDirectory();
 }