Fix the event page sample extension to say "event page".

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

-// Copyright (c) 2012 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-document.body.innerHTML = "";
-
-function addButton(name, cb) {
-  var a = document.createElement("button");
-  a.innerText = name;
-  a.onclick = cb;
-  document.body.appendChild(document.createElement("br"));
-  document.body.appendChild(a);
-}
-
-function log(str) {
-  console.log(str);
-  logDiv.innerHTML += str + "<br>";
-}
-
-addButton("Clear logs", function() {
-  logDiv.innerHTML = "";
-});
-
-addButton("Send message with delayed response", function() {
-  chrome.extension.sendMessage({delayedResponse: true}, function(response) {
-    log("Background page responded: " + response);
-  });
-});
-
-addButton("Show counters", function() {
-  chrome.extension.sendMessage({getCounters: true}, function(response) {
-    log("In-memory counter is: " + response.counter);
-    log("Persisted counter is: " + response.persistentCounter);
-  });
-});
-
-addButton("Set an alarm", function() {
-  chrome.extension.sendMessage({setAlarm: true});
-});
-
-chrome.extension.onMessage.addListener(function(msg, _, sendResponse) {
-  log("Got message from background page: " + msg);
-});
-
-var logDiv = document.createElement("div");
-logDiv.style.border = "1px dashed black";
-document.body.appendChild(document.createElement("br"));
-document.body.appendChild(logDiv);
-
-log("Ready.");