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

chrome/browser/prefs/pref_value_store.h

 // 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.
 
 #ifndef CHROME_BROWSER_PREFS_PREF_VALUE_STORE_H_
 #define CHROME_BROWSER_PREFS_PREF_VALUE_STORE_H_
 #pragma once
 
 #include <map>
 #include <string>
@@ skipping 154 matching lines @@
   // |callback|. |callback| is called with the set of preferences changed by the
   // policy refresh. |callback| is called on the caller's thread as a Task
   // after RefreshPolicyPrefs has returned.
   void RefreshPolicyPrefs(AfterRefreshCallback* callback);
 
   // Returns true if there are proxy preferences in user-modifiable
   // preference stores (e.g. CommandLinePrefStore, ExtensionPrefStore)
   // that conflict with proxy settings specified by proxy policy.
   bool HasPolicyConflictingUserProxySettings();
 
+  // Returns a reference to the extension pref store for write access.
+  PrefStore* GetExtensionPrefStore();
+
  protected:
   // In decreasing order of precedence:
   //   |managed_platform_prefs| contains all managed platform (non-cloud policy)
   //        preference values.
   //   |device_management_prefs| contains all device management (cloud policy)
   //        preference values.
   //   |extension_prefs| contains preference values set by extensions.
   //   |command_line_prefs| contains preference values set by command-line
   //        switches.
   //   |user_prefs| contains all user-set preference values.
@@ skipping 62 matching lines @@
   // A mapping of preference names to their registered types.
   PrefTypeMap pref_types_;
 
   // The associated profile, if applicable.
   Profile* profile_;
 
   DISALLOW_COPY_AND_ASSIGN(PrefValueStore);
 };
 
 #endif  // CHROME_BROWSER_PREFS_PREF_VALUE_STORE_H_