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

net/base/net_log.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 "net/base/net_log.h"
 
 #include "base/bind.h"
 #include "base/logging.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/strings/utf_string_conversions.h"
@@ skipping 258 matching lines @@
   observer->log_level_ = LOG_NONE;
   UpdateLogLevel();
 }
 
 void NetLog::UpdateLogLevel() {
   lock_.AssertAcquired();
 
   // Look through all the observers and find the finest granularity
   // log level (higher values of the enum imply *lower* log levels).
   LogLevel new_effective_log_level = LOG_NONE;
-  ObserverListBase<ThreadSafeObserver>::Iterator it(observers_);
+  ObserverListBase<ThreadSafeObserver>::Iterator it(&observers_);
   ThreadSafeObserver* observer;
   while ((observer = it.GetNext()) != NULL) {
     new_effective_log_level =
         std::min(new_effective_log_level, observer->log_level());
   }
   base::subtle::NoBarrier_Store(&effective_log_level_,
                                 new_effective_log_level);
 }
 
 // static
@@ skipping 198 matching lines @@
 BoundNetLog BoundNetLog::Make(NetLog* net_log,
                               NetLog::SourceType source_type) {
   if (!net_log)
     return BoundNetLog();
 
   NetLog::Source source(source_type, net_log->NextID());
   return BoundNetLog(source, net_log);
 }
 
 }  // namespace net