Store a stacktrace of PrefService destruction in PrefChangeRegistrar

base/prefs/pref_notifier_impl.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 "base/prefs/pref_notifier_impl.h"
 
 #include "base/logging.h"
 #include "base/prefs/pref_service.h"
 #include "base/stl_util.h"
 
@@ skipping 76 matching lines @@
   PrefInitObserverList observers(init_observers_);
   init_observers_.clear();
 
   for (PrefInitObserverList::iterator it = observers.begin();
        it != observers.end();
        ++it) {
     it->Run(succeeded);
   }
 }
 
+// TODO(battre): Delete this. See crbug.com/373435.
+void PrefNotifierImpl::BroadcastPrefServiceDestructionTrace(
+    const std::string& stack_trace) {
+  DCHECK(thread_checker_.CalledOnValidThread());
+  for (PrefObserverMap::iterator observer_iterator = pref_observers_.begin();
+       observer_iterator != pref_observers_.end();
+       ++observer_iterator) {
+    FOR_EACH_OBSERVER(PrefObserver,
+                      *(observer_iterator->second),
+                      SetPrefServiceDestructionTrace(stack_trace));
+  }
+}
+
 void PrefNotifierImpl::FireObservers(const std::string& path) {
   DCHECK(thread_checker_.CalledOnValidThread());
 
   // Only send notifications for registered preferences.
   if (!pref_service_->FindPreference(path.c_str()))
     return;
 
   const PrefObserverMap::iterator observer_iterator =
       pref_observers_.find(path);
   if (observer_iterator == pref_observers_.end())
     return;
 
   FOR_EACH_OBSERVER(PrefObserver,
                     *(observer_iterator->second),
                     OnPreferenceChanged(pref_service_, path));
 }
 
 void PrefNotifierImpl::SetPrefService(PrefService* pref_service) {
   DCHECK(pref_service_ == NULL);
   pref_service_ = pref_service;
 }