Add error messages to JSONReader and friends. This required a bit of refactor...

chrome/browser/extensions/extensions_service.cc

 // Copyright (c) 2006-2008 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/extensions/extensions_service.h"
 
 #include "base/file_util.h"
 #include "base/values.h"
 #include "base/string_util.h"
 #include "base/thread.h"
@@ skipping 68 matching lines @@
      FilePath manifest_path = FilePath::FromWStringHack(child_path).Append(
          Extension::kManifestFilename);
     if (!file_util::PathExists(manifest_path)) {
       ReportExtensionLoadError(frontend.get(), 
                                Extension::kInvalidManifestError);
       continue;
     }
 
     JSONFileValueSerializer serializer(manifest_path.ToWStringHack());
     Value* root = NULL;
-    if (!serializer.Deserialize(&root)) {
+    if (!serializer.Deserialize(&root, NULL)) {
       ReportExtensionLoadError(frontend.get(), 
                                Extension::kInvalidManifestError);
       continue;
     }
 
     if (!root->IsType(Value::TYPE_DICTIONARY)) {
       ReportExtensionLoadError(frontend.get(), 
                                Extension::kInvalidManifestError);
       continue;
     }
@@ skipping 21 matching lines @@
       error));
 }
 
 void ExtensionsServiceBackend::ReportExtensionsLoaded(
     ExtensionsServiceFrontendInterface *frontend, ExtensionList* extensions) {
   frontend->GetMessageLoop()->PostTask(FROM_HERE, NewRunnableMethod(
       frontend,
       &ExtensionsServiceFrontendInterface::OnExtensionsLoadedFromDirectory,
       extensions));
 }