base: Stop passing a non-const ref to ObserverListBase::Iterator.

ipc/ipc_test_sink.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 "ipc/ipc_test_sink.h"
 
 #include "ipc/ipc_listener.h"
 #include "ipc/ipc_message.h"
 
 namespace IPC {
@@ skipping 23 matching lines @@
   NOTIMPLEMENTED();
   return base::ProcessId();
 }
 
 base::ProcessId TestSink::GetSelfPID() const {
   NOTIMPLEMENTED();
   return base::ProcessId();
 }
 
 bool TestSink::OnMessageReceived(const Message& msg) {
-  ObserverListBase<Listener>::Iterator it(filter_list_);
+  ObserverListBase<Listener>::Iterator it(&filter_list_);
   Listener* observer;
   while ((observer = it.GetNext()) != NULL) {
     if (observer->OnMessageReceived(msg))
       return true;
   }
 
   // No filter handled the message, so store it.
   messages_.push_back(Message(msg));
   return true;
 }
@@ skipping 46 matching lines @@
 }
 
 base::ScopedFD TestSink::TakeClientFileDescriptor() {
   NOTREACHED();
   return base::ScopedFD();
 }
 
 #endif  // defined(OS_POSIX) && !defined(OS_NACL)
 
 }  // namespace IPC