Split mode incognito extension can get misleading pref changed events from regular mode

chrome/browser/extensions/extension_prefs.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 "chrome/browser/extensions/extension_prefs.h"
 
 #include "base/string_number_conversions.h"
 #include "base/string_util.h"
 #include "base/utf_string_conversions.h"
 #include "chrome/browser/extensions/admin_policy.h"
@@ skipping 1798 matching lines @@
                                               bool incognito) {
   DCHECK(pref_service()->FindPreference(pref_key.c_str()))
       << "Extension controlled preference key " << pref_key
       << " not registered.";
 
   return extension_pref_value_map_->DoesExtensionControlPref(extension_id,
                                                              pref_key,
                                                              incognito);
 }
 
+bool ExtensionPrefs::DoesExtensionControlIncognitoPref(
+    const std::string& extension_id,
+    const std::string& pref_key) {
+  DCHECK(pref_service()->FindPreference(pref_key.c_str()))
+      << "Extension controlled preference key " << pref_key
+      << " not registered.";
+
+  return extension_pref_value_map_->DoesExtensionControlIncognitoPref(
+      extension_id,
+      pref_key);
+}
+
 bool ExtensionPrefs::HasIncognitoPrefValue(const std::string& pref_key) {
   bool has_incognito_pref_value = false;
   extension_pref_value_map_->GetEffectivePrefValue(pref_key,
                                                    true,
                                                    &has_incognito_pref_value);
   return has_incognito_pref_value;
 }
 
 void ExtensionPrefs::ClearIncognitoSessionOnlyContentSettings() {
   ExtensionIdSet extension_ids;
@@ skipping 50 matching lines @@
                             PrefService::UNSYNCABLE_PREF);
   prefs->RegisterInt64Pref(prefs::kLastExtensionsUpdateCheck,
                            0,  // default value
                            PrefService::UNSYNCABLE_PREF);
   prefs->RegisterInt64Pref(prefs::kNextExtensionsUpdateCheck,
                            0,  // default value
                            PrefService::UNSYNCABLE_PREF);
   prefs->RegisterListPref(prefs::kExtensionAllowedInstallSites,
                           PrefService::UNSYNCABLE_PREF);
 }