Store a stacktrace of PrefService destruction in PrefChangeRegistrar

base/prefs/pref_notifier_impl.cc

Index: base/prefs/pref_notifier_impl.cc
diff --git a/base/prefs/pref_notifier_impl.cc b/base/prefs/pref_notifier_impl.cc
index c02a7b3f5a5bfd8d4bd5c56ce20ca699e6d10346..e2f609e14fe90316946cbe8ba759afc2cbb6dbf3 100644
--- a/base/prefs/pref_notifier_impl.cc
+++ b/base/prefs/pref_notifier_impl.cc
@@ -74,6 +74,19 @@ void PrefNotifierImpl::AddInitObserver(base::Callback<void(bool)> obs) {
   init_observers_.push_back(obs);
 }
 
+// TODO(battre): Delete this. See crbug.com/373435.
+void PrefNotifierImpl::SetPrefServiceDestructionTrace(
+    const std::string& stacktrace) {
+  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(stacktrace));
+  }
+}
+
 void PrefNotifierImpl::OnPreferenceChanged(const std::string& path) {
   FireObservers(path);
 }