Remove race in DeclarativeContentApiTest.RulesPersistence test

chrome/test/data/extensions/api_test/declarative_content/persistence/background.js

Index: chrome/test/data/extensions/api_test/declarative_content/persistence/background.js
diff --git a/chrome/test/data/extensions/api_test/declarative_content/persistence/background.js b/chrome/test/data/extensions/api_test/declarative_content/persistence/background.js
index edc914af4aa3a5dc2aeccf4b77364d4507ecadf2..9785aa50177d7867de72a6d170edcf69a7cfde0d 100644
--- a/chrome/test/data/extensions/api_test/declarative_content/persistence/background.js
+++ b/chrome/test/data/extensions/api_test/declarative_content/persistence/background.js
@@ -36,6 +36,6 @@ chrome.storage.local.get(key, function(items) {
       chrome.storage.local.set(items, sendMessage.bind(null, "ready"));
     });
   } else {
-    sendMessage(sendMessage("second run ready"));
+    sendMessage("second run ready");
   }
 });