Remove .html extension from links

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

 <h1>Google Wallet for Digital Goods</h1>
 
 <table class="intro">
   <tr>
     <td><strong>Description:</strong></td>
     <td>Use Google Wallet for digital goods to sell digital and virtual goods within a Chrome app.</td>
   </tr>
   <tr>
     <td><strong>Availability:</strong></td>
     <td>Chrome 29</td>
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       the generated tokens in your app.
       <strong>NEVER</strong> include the Seller secret you use to generate tokens in your app.
       If you need to generate JWTs dynamically, you should use a server.
       </p>
     </div>
   </li>
 
   <li>Include <a href="https://raw.github.com/GoogleChrome/chrome-app-samples/master/in-app-payments/buy.js">buy.js</a> in your app.
     <div class="indent-small">
       Due to the security restrictions in the
-      <a href="contentSecurityPolicy.html">Content Security Policy</a> for Chrome Apps,
+      <a href="contentSecurityPolicy">Content Security Policy</a> for Chrome Apps,
       you cannot include the <a href="https://raw.github.com/GoogleChrome/chrome-app-samples/master/in-app-payments/buy.js">buy.js</a>
       library from an external location. Instead, you must package the library with your app, and load it from the packaged location.
     </div>
   </li>
 
   <li><a href="https://developers.google.com/commerce/wallet/digital/docs/tutorial#3">Create success and failure callback handlers.</a>
     <div class="indent-small">
       Success and failure callback handlers let your app react to the purchase flow's completion.
     </div>
   </li>
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   <li><a href="https://github.com/GoogleChrome/chrome-app-samples/tree/master/in-app-payments">source code</a></li>
   <li><a href="https://chrome.google.com/webstore/detail/moldiohggmfllblgmikpeoagipenlcae">published app</a> (requires Chrome 29 or higher)</li>
 </ul>
 
 <p>
 You can install and run the published app from the Chrome Web Store to try out the in-app payment purchase flow.
 The app has options to use either the production server or the sandbox server. When testing with the sandbox server,
 use these <a href="https://developers.google.com/commerce/wallet/digital/docs/testing">test credit card numbers</a>,
 which pass basic checks by the Google Wallet for digital goods system.
 </p>