ObserverList::HasObserver now takes a const pointer.

content/browser/appcache/appcache_group.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 "content/browser/appcache/appcache_group.h"
 
 #include <algorithm>
 
 #include "base/bind.h"
 #include "base/logging.h"
@@ skipping 201 matching lines @@
     if (FindObserver(host, queued_observers_)) {
       queued_observers_.RemoveObserver(host);
       observers_.AddObserver(host);
     }
 
     if (!is_obsolete() && !is_being_deleted())
       StartUpdateWithNewMasterEntry(host, it->second);
   }
 }
 
-bool AppCacheGroup::FindObserver(UpdateObserver* find_me,
+// static
+bool AppCacheGroup::FindObserver(
+    const UpdateObserver* find_me,
     const ObserverList<UpdateObserver>& observer_list) {
   return observer_list.HasObserver(find_me);
 }
 
 void AppCacheGroup::ScheduleUpdateRestart(int delay_ms) {
   DCHECK(restart_update_task_.IsCancelled());
   restart_update_task_.Reset(
       base::Bind(&AppCacheGroup::RunQueuedUpdates, this));
   base::MessageLoop::current()->PostDelayedTask(
       FROM_HERE,
@@ skipping 22 matching lines @@
     // deletion by adding an extra ref in this scope (but only if we're not
     // in our destructor).
     scoped_refptr<AppCacheGroup> protect(is_in_dtor_ ? NULL : this);
     FOR_EACH_OBSERVER(UpdateObserver, observers_, OnUpdateComplete(this));
     if (!queued_updates_.empty())
       ScheduleUpdateRestart(kUpdateRestartDelayMs);
   }
 }
 
 }  // namespace content