Fix for Bug 50726 "Save extension list and "winning" prefs from extensions"

chrome/browser/prefs/pref_value_store.cc

 // Copyright (c) 2010 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 "chrome/browser/prefs/pref_value_store.h"
 
 #include "chrome/browser/browser_thread.h"
 #include "chrome/browser/extensions/extension_pref_store.h"
 #include "chrome/browser/policy/configuration_policy_pref_store.h"
 #include "chrome/browser/prefs/command_line_pref_store.h"
@@ skipping 38 matching lines @@
       pref_filename,
       BrowserThread::GetMessageLoopProxyForThread(BrowserThread::FILE));
   InMemoryPrefStore* default_store = new InMemoryPrefStore();
 
   if (!user_only) {
     managed =
         ConfigurationPolicyPrefStore::CreateManagedPlatformPolicyPrefStore();
     device_management =
         ConfigurationPolicyPrefStore::CreateDeviceManagementPolicyPrefStore(
             profile);
-    extension = new ExtensionPrefStore(profile, PrefNotifier::EXTENSION_STORE);
+    extension = new ExtensionPrefStore(profile);
     command_line = new CommandLinePrefStore(CommandLine::ForCurrentProcess());
     recommended =
         ConfigurationPolicyPrefStore::CreateRecommendedPolicyPrefStore();
   }
   return new PrefValueStore(managed, device_management, extension,
                             command_line, user, recommended, default_store,
                             profile);
 }
 
 PrefValueStore::~PrefValueStore() {}
@@ skipping 71 matching lines @@
   const std::string name(path);
   bool rv = GetValue(name, &tmp_value);
   // Merely registering a pref doesn't count as "having" it: we require a
   // non-default value set.
   return rv && !PrefValueFromDefaultStore(path);
 }
 
 bool PrefValueStore::PrefHasChanged(const char* path,
                                     PrefNotifier::PrefStoreType new_store) {
   DCHECK(new_store != PrefNotifier::INVALID_STORE);
+  // If we get a change notification about an unregistered preference,
+  // discard it silently because there cannot be any listeners.
+  if (pref_types_.find(path) == pref_types_.end())
+    return false;
+
   // Replying that the pref has changed may cause problems, but it's the safer
   // choice.
   if (new_store == PrefNotifier::INVALID_STORE)
     return true;
 
   PrefNotifier::PrefStoreType controller = ControllingPrefStoreForPref(path);
-  DCHECK(controller != PrefNotifier::INVALID_STORE);
+  DCHECK(controller != PrefNotifier::INVALID_STORE)
+      << "Invalid controller for path " << path;
   if (controller == PrefNotifier::INVALID_STORE)
     return true;
 
   // If the pref is controlled by a higher-priority store, its effective value
   // cannot have changed.
   if (controller < new_store)
     return false;
 
   // Otherwise, we take the pref store's word that something changed.
   return true;
@@ skipping 310 matching lines @@
   pref_stores_[PrefNotifier::MANAGED_PLATFORM_STORE].reset(
       managed_platform_prefs);
   pref_stores_[PrefNotifier::DEVICE_MANAGEMENT_STORE].reset(
       device_management_prefs);
   pref_stores_[PrefNotifier::EXTENSION_STORE].reset(extension_prefs);
   pref_stores_[PrefNotifier::COMMAND_LINE_STORE].reset(command_line_prefs);
   pref_stores_[PrefNotifier::USER_STORE].reset(user_prefs);
   pref_stores_[PrefNotifier::RECOMMENDED_STORE].reset(recommended_prefs);
   pref_stores_[PrefNotifier::DEFAULT_STORE].reset(default_prefs);
 }