Remove .html extension from links

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

 <h1>Analytics</h1>
 
 <table class="intro">
   <tr>
     <td><strong>Description:</strong></td>
     <td>Use the Chrome Platform Analytics JavaScript library to measure user interactions with your app.</td>
   </tr>
   <tr>
     <td><strong>Samples:</strong></td>
     <td><a href="https://github.com/GoogleChrome/chrome-platform-analytics/tree/master/src/example">JavaScript and Closure examples</a></td>
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 <p>
 The <a href="https://developers.google.com/analytics/devguides/platform/">Google Analytics Platform</a> lets you
 measure user interactions with your business across various devices and environments. The platform provides resources to
 collect, store, process, and report on user interactions.
 <a href="https://github.com/GoogleChrome/chrome-platform-analytics/wiki">Chrome Platform Analytics</a> (CPA) is
 a client library that lets you collect user interactions in Packaged Apps and Extensions,
 and send them to the Google Analytics Platform.
 </p>
 
 <p>
-The CPA library follows the basic usage pattern of <a href="http://www.google.com/analytics/index.html">Google Analytics</a>
+The CPA library follows the basic usage pattern of <a href="http://www.google.com/analytics/index">Google Analytics</a>
 and will feel familiar to existing users of Google Analytics.
 However, unlike the web-centric official Google Analytics JavaScript libraries, the CPA library uses an "app-centric" model
 that is better suited for Packaged Apps. Among other features, the library provides methods for specific types of hits,
 such as "event" and "appView", and it can be used in both Closure-based and traditional JavaScript projects.
 </p>
 
 <h2 id="privacy">Privacy</h2>
 
 <p>
 <a href="https://developers.google.com/analytics/devguides/collection/protocol/policy">Google Analytics Policies</a>
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   <li><a href="https://github.com/GoogleChrome/chrome-platform-analytics/wiki#how-to">How-To</a></li>
 </ul>
 
 
 <h2 id="examples">Examples</h2>
 
 <p>
 For an illustration of how to use the CPA library to measure user interactions in an app, see the 
 <a href="https://github.com/GoogleChrome/chrome-platform-analytics/tree/master/src/example">examples</a>.
 </p>