Remove .html extension from links

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

 <h1 class="page_title">chrome.experimental.* APIs</h1>
 
 <h2 id="overview">
 List of APIs
 </h2>
 
 {{^is_apps}}
 <p class="doc-family extensions">
 We'd like your <a href="http://groups.google.com/a/chromium.org/group/chromium-extensions/topics">feedback</a>
 on the following experimental APIs:
 </p>
 {{/is_apps}}
 
 {{+partials.api_table apis:apis is_stable:false/}}
 
 {{^is_apps}}
 <p class="doc-family extensions">
 Pay special attention to the following APIs,
 which we expect to finalize soon:
 <b>devtools</b>,
 <b>permissions</b>,
 For examples of using the experimental APIs, see
-<a href="samples.html#experimental">Samples</a>.
+<a href="samples#experimental">Samples</a>.
 </p>
 {{/is_apps}}
 
 <p class="warning">
 <b>Caution:</b>
 Don't depend on these experimental APIs.
 They might disappear,
 and they <em>will</em> change.
 Also, the Chrome Web Store doesn't allow you to
 upload items that use experimental APIs.
 </p>
 
 
 <h2 id="using">How to use experimental APIs</h2>
 
 <ol>
   {{^is_apps}}
   <li class="doc-family extensions">
     Make sure you're using either
     <a href="http://tools.google.com/dlpage/chromesxs">Canary</a>
     (which you can use at the same time as other Chrome channels) or the
 <a href="http://www.chromium.org/getting-involved/dev-channel">Dev channel</a>.
     Although the experimental APIs might work in other versions,
     we need your feedback on the latest incarnation of the APIs,
     which you can find in Canary and on the Dev channel.
   </li>
   {{/is_apps}}
   <li>
     Specify the "experimental"
-    <a href="declare_permissions.html">permission</a>
+    <a href="declare_permissions">permission</a>
     in your manifest, like this:
 <pre data-filename="manifest.json">
 "permissions": [
   <b>"experimental"</b>,
   ...
 ],
 </pre>
   </li>
   <li>
     Enable the experimental API in your browser.
@@ skipping 26 matching lines @@
     improve the APIs and decide
     which ones should move from experimental to supported.
   </li>
   {{/is_apps}}
 </ol>
 
 <h2 id="other">More APIs</h2>
 
 <p>
 For information on the standard APIs, see
-<a href="api_index.html">chrome.* APIs</a> and
-<a href="api_other.html">Other APIs</a>.
+<a href="api_index">chrome.* APIs</a> and
+<a href="api_other">Other APIs</a>.
 </p>