Revert of Correctly handle tab navigation in the app list.

chrome/test/data/extensions/platform_apps/custom_launcher_page/main.js

Index: chrome/test/data/extensions/platform_apps/custom_launcher_page/main.js
diff --git a/chrome/test/data/extensions/platform_apps/custom_launcher_page/main.js b/chrome/test/data/extensions/platform_apps/custom_launcher_page/main.js
index ce4fdc07ac7132465ed16042a902cded91dc09a0..bd16ca65576c3e0474bc231c5557f4082119e43e 100644
--- a/chrome/test/data/extensions/platform_apps/custom_launcher_page/main.js
+++ b/chrome/test/data/extensions/platform_apps/custom_launcher_page/main.js
@@ -31,15 +31,4 @@
   });
 }
 
-document.addEventListener('DOMContentLoaded', function() {
-  chrome.test.sendMessage('Launched');
-});
-
-var textfield = document.getElementById('textfield');
-textfield.onfocus = function() {
-  chrome.test.sendMessage('textfieldFocused');
-};
-
-textfield.onblur = function() {
-  chrome.test.sendMessage('textfieldBlurred');
-};
+chrome.test.sendMessage('Launched');