Remove .html extension from links

chrome/common/extensions/docs/templates/articles/app_codelab6_lifecycle.html

Index: chrome/common/extensions/docs/templates/articles/app_codelab6_lifecycle.html
diff --git a/chrome/common/extensions/docs/templates/articles/app_codelab6_lifecycle.html b/chrome/common/extensions/docs/templates/articles/app_codelab6_lifecycle.html
index 8e7000be62ec681aee0c26f4e78168919e00eeb1..43a57ac0e99ae13aec1b2e8d72c02769c3c0bdf8 100644
--- a/chrome/common/extensions/docs/templates/articles/app_codelab6_lifecycle.html
+++ b/chrome/common/extensions/docs/templates/articles/app_codelab6_lifecycle.html
@@ -35,7 +35,7 @@ reload the app and test again:</p>
 
 <pre data-filename="main.js">
 chrome.app.runtime.onLaunched.addListener(function() {
-    chrome.app.window.create(&#39;index.html&#39;,
+    chrome.app.window.create(&#39;index&#39;,
       {id: &#39;mainwindow&#39;, bounds: {width: 500, height: 309} });
   });
 </pre>
@@ -61,7 +61,7 @@ only restoring it if the <code>onRestarted</code> event is triggered.</p>
 
 <p class="note"><b>Note:</b>
 We learned about <code>chrome.storage.sync</code> before, but
-<a href="storage.html#using-sync">chrome.storage.local</a>
+<a href="storage#using-sync">chrome.storage.local</a>
 wasn&#39;t mentioned until now.
 Both have exactly the same syntax,
 but the semantics of <code>chrome.storage.local</code> is, as the name says, completely local.
@@ -90,7 +90,7 @@ chrome.app.runtime.onRestarted.addListener(function() {
 });
 
 function runApp(readInitialState) {
-  chrome.app.window.create(&#39;index.html&#39;,
+  chrome.app.window.create(&#39;index&#39;,
     {id: &#39;mainwindow&#39;, bounds: {width: 500, height: 309} },
     // the create callback gets a reference to the AppWindow obj
     function(win) {
@@ -201,11 +201,11 @@ you can move logic that is shared amoung windows to the event page.</li>
 
 <h2 id="you_should_also_read">You should also read</h2>
 
-<p><a href="app_lifecycle.html">Manage App Lifecycle</a> tutorial</p>
+<p><a href="app_lifecycle">Manage App Lifecycle</a> tutorial</p>
 
 <h2 id="what_39_s_next_">What's next?</h2>
 
-<p>In <a href="app_codelab7_useridentification.html">6 - Access User's Data</a>,
+<p>In <a href="app_codelab7_useridentification">6 - Access User's Data</a>,
 you will learn how to identify users and use OAuth2.0 to access Google and other third party services.</p>
 
 <p class="note"><b>Note:</b>