Fix transient page sample extension to use 'runtime' API, which landed just

chrome/common/extensions/docs/examples/api/transientPage/basic/background.js

Index: chrome/common/extensions/docs/examples/api/transientPage/basic/background.js
diff --git a/chrome/common/extensions/docs/examples/api/transientPage/basic/background.js b/chrome/common/extensions/docs/examples/api/transientPage/basic/background.js
index 33567292ad927b6335cc81b6c2f9da0295e60ab4..6c65ba0b2a6b36f105df5a05fee3fa2b522c5992 100644
--- a/chrome/common/extensions/docs/examples/api/transientPage/basic/background.js
+++ b/chrome/common/extensions/docs/examples/api/transientPage/basic/background.js
@@ -18,7 +18,7 @@ sendMessage();
 chrome.browserAction.setBadgeText({text: "ON"});
 console.log("Loaded.");
 
-chrome.experimental.extension.onInstalled.addListener(function() {
+chrome.experimental.runtime.onInstalled.addListener(function() {
   // localStorage is persisted, so it's a good place to keep state that you
   // need to persist across page reloads.
   localStorage.counter = 1;
@@ -64,7 +64,7 @@ chrome.experimental.alarms.onAlarm.addListener(function() {
   alert("Time's up!");
 });
 
-chrome.experimental.extension.onBackgroundPageUnloadingSoon.addListener(
+chrome.experimental.runtime.onBackgroundPageUnloadingSoon.addListener(
     function() {
   chrome.tabs.query({active: true, currentWindow: true}, function(tabs) {
     // After the unload event listener runs, the page will unload, so any