Refactor extension event distribution to use Values instead of JSON strings.

chrome/browser/extensions/api/management/management_api.cc

 // Copyright (c) 2012 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/api/management/management_api.h"
 
 #include <map>
 #include <string>
 
 #include "base/basictypes.h"
@@ skipping 574 matching lines @@
       event_name = events::kOnExtensionEnabled;
       break;
     case chrome::NOTIFICATION_EXTENSION_UNLOADED:
       event_name = events::kOnExtensionDisabled;
       break;
     default:
       NOTREACHED();
       return;
   }
 
-  ListValue args;
+  scoped_ptr<ListValue> args(new ListValue());
   if (event_name == events::kOnExtensionUninstalled) {
-    args.Append(Value::CreateStringValue(
+    args->Append(Value::CreateStringValue(
         content::Details<const extensions::Extension>(details).ptr()->id()));
   } else {
     const Extension* extension = NULL;
     if (event_name == events::kOnExtensionDisabled) {
       extension = content::Details<extensions::UnloadedExtensionInfo>(
           details)->extension;
     } else {
       extension = content::Details<const Extension>(details).ptr();
     }
     CHECK(extension);
     ExtensionService* service = profile->GetExtensionService();
-    args.Append(CreateExtensionInfo(*extension, service));
+    args->Append(CreateExtensionInfo(*extension, service));
   }
 
-  std::string args_json;
-  base::JSONWriter::Write(&args, &args_json);
-
   profile->GetExtensionEventRouter()->DispatchEventToRenderers(
-      event_name, args_json, NULL, GURL(), extensions::EventFilteringInfo());
+      event_name, args.Pass(), NULL, GURL(), extensions::EventFilteringInfo());
 }