Store a stacktrace of PrefService destruction in PrefChangeRegistrar

base/prefs/pref_notifier_impl_unittest.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 "base/bind.h"
 #include "base/callback.h"
 #include "base/prefs/mock_pref_change_callback.h"
 #include "base/prefs/pref_notifier_impl.h"
 #include "base/prefs/pref_observer.h"
 #include "base/prefs/pref_registry_simple.h"
@@ skipping 62 matching lines @@
   using PrefNotifierImpl::OnPreferenceChanged;
   using PrefNotifierImpl::OnInitializationCompleted;
 };
 
 class PrefObserverMock : public PrefObserver {
  public:
   PrefObserverMock() {}
   virtual ~PrefObserverMock() {}
 
   MOCK_METHOD2(OnPreferenceChanged, void(PrefService*, const std::string&));
+
+  // TODO(battre) Remove function. See crbug.com/373435.
+  MOCK_METHOD1(SetPrefServiceDestructionTrace, void(const std::string&));
 };
 
 // Test fixture class.
 class PrefNotifierTest : public testing::Test {
  protected:
   virtual void SetUp() {
     pref_service_.registry()->RegisterBooleanPref(kChangedPref, true);
     pref_service_.registry()->RegisterBooleanPref(kUnchangedPref, true);
   }
 
@@ skipping 118 matching lines @@
   EXPECT_CALL(obs2_, OnPreferenceChanged(&pref_service_, kChangedPref));
   notifier.OnPreferenceChanged(kChangedPref);
   Mock::VerifyAndClearExpectations(&obs1_);
   Mock::VerifyAndClearExpectations(&obs2_);
 
   notifier.RemovePrefObserver(kChangedPref, &obs2_);
   notifier.RemovePrefObserver(kUnchangedPref, &obs2_);
 }
 
 }  // namespace