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

chrome/browser/extensions/api/runtime/runtime_api.cc

Index: chrome/browser/extensions/api/runtime/runtime_api.cc
diff --git a/chrome/browser/extensions/api/runtime/runtime_api.cc b/chrome/browser/extensions/api/runtime/runtime_api.cc
index 4376b799662c22993b438c16635d2cd5f83ef39c..47b8f571b5716a4b63e9fa22d4a19dcfd32af1ba 100644
--- a/chrome/browser/extensions/api/runtime/runtime_api.cc
+++ b/chrome/browser/extensions/api/runtime/runtime_api.cc
@@ -35,9 +35,10 @@ void RuntimeEventRouter::DispatchOnInstalledEvent(
   // chance to register for events. So we register on its behalf. If the
   // extension does not actually have a listener, the event will just be
   // ignored.
+  scoped_ptr<ListValue> event_args(new ListValue());
   system->event_router()->AddLazyEventListener(kOnInstalledEvent, extension_id);
   system->event_router()->DispatchEventToExtension(
-      extension_id, kOnInstalledEvent, "[]", NULL, GURL());
+      extension_id, kOnInstalledEvent, event_args.Pass(), NULL, GURL());
 }
 
 bool RuntimeGetBackgroundPageFunction::RunImpl() {