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

chrome/browser/extensions/extension_file_util.h

Index: chrome/browser/extensions/extension_file_util.h
===================================================================
--- chrome/browser/extensions/extension_file_util.h	(revision 32098)
+++ chrome/browser/extensions/extension_file_util.h	(working copy)
@@ -94,6 +94,9 @@
                                        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