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 64106fec0ec8f93e181a301da90ca6fd4d656f81..2f9535f05bbd4383a9e2cbf4e98b2aedbf5a3865 100644
--- a/chrome/browser/extensions/api/runtime/runtime_api.cc
+++ b/chrome/browser/extensions/api/runtime/runtime_api.cc
@@ -37,7 +37,7 @@ void RuntimeEventRouter::DispatchOnInstalledEvent(
   // ignored.
   system->event_router()->AddLazyEventListener(kOnInstalledEvent, extension_id);
   system->event_router()->DispatchEventToExtension(
-      extension_id, kOnInstalledEvent, "[]", NULL, GURL());
+      extension_id, kOnInstalledEvent, NULL, NULL, GURL());
 }
 
 bool RuntimeGetBackgroundPageFunction::RunImpl() {