ObserverList::HasObserver now takes a const pointer.

content/browser/appcache/appcache_group.cc

Index: content/browser/appcache/appcache_group.cc
diff --git a/content/browser/appcache/appcache_group.cc b/content/browser/appcache/appcache_group.cc
index 7ebd2890ba4791fcef9c3a29a0ebeb569860c69a..ce6d873638bd3b3d43b5a87aa2b3dc7cd00d4573 100644
--- a/content/browser/appcache/appcache_group.cc
+++ b/content/browser/appcache/appcache_group.cc
@@ -219,7 +219,9 @@ void AppCacheGroup::RunQueuedUpdates() {
   }
 }
 
-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);
 }