Parse messages.json in ExtensionUnpacker (like we do for manifest)....

chrome/browser/extensions/extension_file_util.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_FILE_UTIL_H_
 #define CHROME_BROWSER_EXTENSIONS_EXTENSION_FILE_UTIL_H_
 
 #include <set>
 #include <string>
 
@@ skipping 76 matching lines @@
                               const std::set<std::string>& installed_ids);
 
 // Loads locale information if _locales folder is present.
 // Returns message bundle if there were no errors. If _locales folder is not
 // present it returns NULL with empty error string.
 // Loading failed only if function returns NULL and error is not empty.
 ExtensionMessageBundle* LoadLocaleInfo(const FilePath& extension_path,
                                        const DictionaryValue& manifest,
                                        std::string* error);
 
+// Validates locale info. Doesn't check if messages.json files are valid.
+bool ValidateLocaleInfo(const Extension& extension, std::string* error);

[Aaron Boodman, 2009/11/18 01:31:42]

Since this doesn't need to be called from outside the .cc file, you should make
it static and omit this in the header.

+
 // We need to reserve the namespace of entries that start with "_" for future
 // use by Chrome.
 // If any files or directories are found using "_" prefix and are not on
 // reserved list we return false, and set error message.
 bool CheckForIllegalFilenames(const FilePath& extension_path,
                               std::string* error);
 
 }  // extension_file_util
 
 #endif  // CHROME_BROWSER_EXTENSIONS_EXTENSION_FILE_UTIL_H_