Add DCHECKs to StatefulExternalExtensionProvider

chrome/browser/extensions/stateful_external_extension_provider.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_STATEFUL_EXTERNAL_EXTENSION_PROVIDER_H_
 #define CHROME_BROWSER_EXTENSIONS_STATEFUL_EXTERNAL_EXTENSION_PROVIDER_H_
 #pragma once
 
 #include "chrome/browser/extensions/external_extension_provider.h"
 
@@ skipping 28 matching lines @@
   virtual bool GetExtensionDetails(const std::string& id,
                                    Extension::Location* location,
                                    scoped_ptr<Version>* version) const;
  protected:
   // Location for external extensions that are provided by this provider from
   // local crx files.
   const Extension::Location crx_location_;
   // Location for external extensions that are provided by this provider from
   // update URLs.
   const Extension::Location download_location_;
+
+  // Stores the dictionary of external extensions internally. Takes ownership
+  // of |prefs|.
+  void set_prefs(DictionaryValue* prefs);
+
+ private:
   // Dictionary of the external extensions that are provided by this provider.
   scoped_ptr<DictionaryValue> prefs_;
 };
 
 #endif  // CHROME_BROWSER_EXTENSIONS_STATEFUL_EXTERNAL_EXTENSION_PROVIDER_H_