Update references to the extension messaging APIs to point to the "runtime"

chrome/test/data/extensions/uitest/window_open/newtab.js

Index: chrome/test/data/extensions/uitest/window_open/newtab.js
diff --git a/chrome/test/data/extensions/uitest/window_open/newtab.js b/chrome/test/data/extensions/uitest/window_open/newtab.js
index 7718f042fe9b9f74319b5e9a052b5bae3e4a2da0..7721a9714e66aa2d519461c7d0215492c560c5dd 100644
--- a/chrome/test/data/extensions/uitest/window_open/newtab.js
+++ b/chrome/test/data/extensions/uitest/window_open/newtab.js
@@ -6,7 +6,7 @@ function testExtensionApi() {
   try {
     chrome.tabs.getAllInWindow(null, function() {
       window.domAutomationController.send(
-          !chrome.extension.lastError);
+          !chrome.runtime.lastError);
     });
   } catch (e) {
     window.domAutomationController.send(false);