Store a stacktrace of PrefService destruction in PrefChangeRegistrar

base/prefs/pref_value_store_unittest.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 <string>
 
 #include "base/bind.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/prefs/pref_notifier.h"
 #include "base/prefs/pref_value_store.h"
 #include "base/prefs/testing_pref_store.h"
 #include "base/values.h"
 #include "testing/gmock/include/gmock/gmock.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 using testing::Mock;
 using testing::_;
 
 namespace {
 
 // Allows to capture pref notifications through gmock.
 class MockPrefNotifier : public PrefNotifier {
  public:
   MOCK_METHOD1(OnPreferenceChanged, void(const std::string&));
   MOCK_METHOD1(OnInitializationCompleted, void(bool));
+  // TODO(battre) Remove function. See crbug.com/373435.
+  MOCK_METHOD1(BroadcastPrefServiceDestructionTrace, void(const std::string&));
 };
 
 // Allows to capture sync model associator interaction.
 class MockPrefModelAssociator {
  public:
   MOCK_METHOD1(ProcessPrefChange, void(const std::string&));
 };
 
 }  // namespace
 
@@ skipping 624 matching lines @@
       prefs::kCommandLinePref));
   EXPECT_TRUE(pref_value_store_->PrefValueExtensionModifiable(
       prefs::kUserPref));
   EXPECT_TRUE(pref_value_store_->PrefValueExtensionModifiable(
       prefs::kRecommendedPref));
   EXPECT_TRUE(pref_value_store_->PrefValueExtensionModifiable(
       prefs::kDefaultPref));
   EXPECT_TRUE(pref_value_store_->PrefValueExtensionModifiable(
       prefs::kMissingPref));
 }