detect preferences errors

chrome/browser/extensions/extension_prefs.h

 // Copyright (c) 2009 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_EXTENSIONS_EXTENSION_PREFS_H_
 #define CHROME_BROWSER_EXTENSIONS_EXTENSION_PREFS_H_
 
 #include <set>
 #include <string>
 #include <vector>
@@ skipping 95 matching lines @@
   // and neither will external extensions the user has explicitly uninstalled.
   // Caller takes ownership of returned structure.
   ExtensionsInfo* GetInstalledExtensionsInfo();
 
   // Returns the ExtensionInfo from the prefs for the given extension. If the
   // extension is not present, NULL is returned.
   ExtensionInfo* GetInstalledExtensionInfo(const std::string& extension_id);
 
   static void RegisterUserPrefs(PrefService* prefs);
 
+  // The underlying PrefService.
+  PrefService* pref_service() const { return prefs_; }
+
  private:
 
   // Converts absolute paths in the pref to paths relative to the
   // install_directory_.
   void MakePathsRelative();
 
   // Converts internal relative paths to be absolute. Used for export to
   // consumers who expect full paths.
   void MakePathsAbsolute(DictionaryValue* dict);
 
@@ skipping 30 matching lines @@
   // Base extensions install directory.
   FilePath install_directory_;
 
   // The URLs of all of the toolstrips.
   URLList shelf_order_;
 
   DISALLOW_COPY_AND_ASSIGN(ExtensionPrefs);
 };
 
 #endif  // CHROME_BROWSER_EXTENSIONS_EXTENSION_PREFS_H_