Attempt to fix flaky OmniboxApiTest.Basic.

chrome/test/data/extensions/api_test/omnibox/test.html

Index: chrome/test/data/extensions/api_test/omnibox/test.html
diff --git a/chrome/test/data/extensions/api_test/omnibox/test.html b/chrome/test/data/extensions/api_test/omnibox/test.html
index 395596262bdad6a540f6b254f4e88ebaf9a49e5a..6c2c6e0f69abf78052822dc0504999902debbe09 100644
--- a/chrome/test/data/extensions/api_test/omnibox/test.html
+++ b/chrome/test/data/extensions/api_test/omnibox/test.html
@@ -3,7 +3,7 @@ if (!chrome.omnibox) {
   chrome.omnibox = chrome.experimental.omnibox;
 }
 
-chrome.experimental.omnibox.onInputChanged.addListener(
+chrome.omnibox.onInputChanged.addListener(
   function(text, suggest) {
     suggest([
       {content: text + "n1", description: "description1"},
@@ -12,7 +12,7 @@ chrome.experimental.omnibox.onInputChanged.addListener(
     ]);
   });
 
-chrome.experimental.omnibox.onInputEntered.addListener(
+chrome.omnibox.onInputEntered.addListener(
   function(text) {
     chrome.test.assertEq("command", text);
     chrome.test.notifyPass();