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

chrome/browser/utility_process_host_unittest.cc

 // 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.
 
 #include "chrome/browser/utility_process_host.h"
 
 #include "base/file_path.h"
 #include "base/file_util.h"
 #include "base/logging.h"
 #include "base/message_loop.h"
@@ skipping 25 matching lines @@
 class TestUtilityProcessHostClient : public UtilityProcessHost::Client {
  public:
   explicit TestUtilityProcessHostClient() : success_(false) {
   }
 
   // UtilityProcessHost::Client methods.
   virtual void OnProcessCrashed() {
     NOTREACHED();
   }
 
-  virtual void OnUnpackExtensionSucceeded(const DictionaryValue& manifest) {
+  virtual void OnUnpackExtensionSucceeded(const DictionaryValue& manifest,
+                                          const DictionaryValue& catalogs) {
     success_ = true;
   }
 
   virtual void OnUnpackExtensionFailed(const std::string& error_message) {
     NOTREACHED();
   }
 
   virtual void OnUnpackWebResourceSucceeded(
       const ListValue& json_data) {
     NOTREACHED();
@@ skipping 96 matching lines @@
       temp_extension_dir.AppendASCII("theme.crx"));
   observer.RunUntilClose(process_host->id());
   EXPECT_TRUE(client->success());
 
   // Clean up the temp dir.
   file_util::Delete(temp_extension_dir, true);
 }
 #endif
 
 }  // namespace