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

chrome/browser/extensions/permissions_updater.cc

Index: chrome/browser/extensions/permissions_updater.cc
diff --git a/chrome/browser/extensions/permissions_updater.cc b/chrome/browser/extensions/permissions_updater.cc
index e56fbba23a768e5fffca50c36dfc209b29ec88ef..aa06d0ac0dacc68b7c3dc1e898b466308cb49fa5 100644
--- a/chrome/browser/extensions/permissions_updater.cc
+++ b/chrome/browser/extensions/permissions_updater.cc
@@ -117,14 +117,12 @@ void PermissionsUpdater::DispatchEvent(
   if (!profile_ || !profile_->GetExtensionEventRouter())
     return;
 
-  ListValue value;
+  scoped_ptr<ListValue> value(new ListValue());
   scoped_ptr<api::permissions::Permissions> permissions =
     PackPermissionSet(changed_permissions);
-  value.Append(permissions->ToValue().release());
-  std::string json_value;
-  base::JSONWriter::Write(&value, &json_value);
+  value->Append(permissions->ToValue().release());
   profile_->GetExtensionEventRouter()->DispatchEventToExtension(
-      extension_id, event_name, json_value, profile_, GURL());
+      extension_id, event_name, value.Pass(), profile_, GURL());
 }
 
 void PermissionsUpdater::NotifyPermissionsUpdated(