ObserverList::HasObserver now takes a const pointer.

components/invalidation/invalidator_registrar.h

 // Copyright 2014 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.
 
 #ifndef COMPONENTS_INVALIDATION_INVALIDATOR_REGISTRAR_H_
 #define COMPONENTS_INVALIDATION_INVALIDATOR_REGISTRAR_H_
 
 #include <map>
 
 #include "base/basictypes.h"
@@ skipping 58 matching lines @@
   // Returns the current invalidator state.  When called from within
   // InvalidationHandler::OnInvalidatorStateChange(), this returns the
   // updated state.
   InvalidatorState GetInvalidatorState() const;
 
   // Gets a new map for the name of invalidator handlers and their
   // objects id. This is used by the InvalidatorLogger to be able
   // to display every registered handlers and its objectsIds.
   std::map<std::string, ObjectIdSet> GetSanitizedHandlersIdsMap();
 
-  bool IsHandlerRegisteredForTest(InvalidationHandler* handler) const;
+  bool IsHandlerRegisteredForTest(const InvalidationHandler* handler) const;
 
   // Needed for death tests.
   void DetachFromThreadForTest();
 
  private:
   typedef std::map<InvalidationHandler*, ObjectIdSet> HandlerIdsMap;
 
   base::ThreadChecker thread_checker_;
   ObserverList<InvalidationHandler, true> handlers_;
   HandlerIdsMap handler_to_ids_map_;
   InvalidatorState state_;
 
   DISALLOW_COPY_AND_ASSIGN(InvalidatorRegistrar);
 };
 
 }  // namespace syncer
 
 #endif  // COMPONENTS_INVALIDATION_INVALIDATOR_REGISTRAR_H_