Remove .html extension from links

chrome/common/extensions/docs/templates/articles/app_codelab3_mvc.html

Index: chrome/common/extensions/docs/templates/articles/app_codelab3_mvc.html
diff --git a/chrome/common/extensions/docs/templates/articles/app_codelab3_mvc.html b/chrome/common/extensions/docs/templates/articles/app_codelab3_mvc.html
index 6a22f9c905a7bd5fb3d207167da83f1ddc365e95..00212c923ddef04c1619e8df9690a1e6c12b8d90 100644
--- a/chrome/common/extensions/docs/templates/articles/app_codelab3_mvc.html
+++ b/chrome/common/extensions/docs/templates/articles/app_codelab3_mvc.html
@@ -9,7 +9,7 @@ is the Model-View-Controller (MVC) and its variants,
 like Model-View-Presentation (MVP).</p>
 
 <p>There are several frameworks to help apply
-<a href="app_frameworks.html">MVC concepts</a>
+<a href="app_frameworks">MVC concepts</a>
 to a Javascript application, and most of them,
 as long as they are CSP compliant, can be used in a Chrome App.
 In this lab,
@@ -405,7 +405,7 @@ Check the results by reloading the app: open the app, right-click and select Rel
 
 <ul>
 <li><p>Chrome Apps are
-<a href="offline_apps.html">offline first</a>,
+<a href="offline_apps">offline first</a>,
 so the recommended way to include third-party scripts is to download
 and package them inside your app.</p></li>
 <li><p>You can use any framework you want,
@@ -418,11 +418,11 @@ Use them, specially if you want to build a non-trivial application.</p></li>
 <h2 id="you_should_also_read">You should also read</h2>
 
 <ul>
-<li><p><a href="angular_framework.html">Build Apps with AngularJS</a> tutorial</p></li>
+<li><p><a href="angular_framework">Build Apps with AngularJS</a> tutorial</p></li>
 <li><p><a href="http://angularjs.org/">AngularJS Todo</a> tutorial</p></li>
 </ul>
 
 <h2 id="what_39_s_next_">What's next?</h2>
 
-<p>In <a href="app_codelab5_data.html">4 - Save and Fetch Data</a>,
+<p>In <a href="app_codelab5_data">4 - Save and Fetch Data</a>,
 you will modify your Todo list app so that Todo items are saved.</p>