[DOCS] Edit references to Chrome 31 and earlier.

native_client_sdk/doc_generated/sdk/download.html

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 <section id="download-the-native-client-sdk">
 <span id="download"></span><h1 id="download-the-native-client-sdk"><span id="download"></span>Download the Native Client SDK</h1>
 <p>This page provides an overview of the Native Client SDK, and instructions for
 downloading and installing the SDK.</p>
 <div id="home">
 <a class="button-nacl button-download" href="http://storage.googleapis.com/nativeclient-mirror/nacl/nacl_sdk/nacl_sdk.zip">Download SDK Zip File</a>
 </div><h2 id="overview"><span id="sdk-overview"></span>Overview</h2>
 <p>The Native Client SDK includes:</p>
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 </pre>
 <p>The sample output above shows that several bundles are available for
 download, and that you have already installed the latest revision of the
 <code>sdk_tools</code> bundle, which was included in the zip file. You never need to
 update the <code>sdk_tools</code> bundle. It is updated automatically (if necessary)
 whenever you run <code>naclsdk</code>.</p>
 <p>Bundles are labeled post-stable, stable, beta, dev, or canary. These labels
 usually correspond to the current versions of Chrome. We recommend that you
 develop against a &#8220;stable&#8221; bundle, because such bundles can be used by all
 current Chrome users. Native Client is designed to be backward-compatible.For
-example, applications developed with the <code>pepper_31</code> bundle can run in
-Chrome 31, Chrome 32, etc..</p>
+example, applications developed with the <code>pepper_37</code> bundle can run in
+Chrome 37, Chrome 38, etc..</p>
 </li>
 <li><p class="first">Run <code>naclsdk</code> with the <code>update</code> command to download recommended bundles,
 including the current &#8220;stable&#8221; bundle.</p>
 <p>On Mac/Linux:</p>
 <pre class="prettyprint">
 $ ./naclsdk update
 </pre>
 <p>On Windows:</p>
 <pre class="prettyprint">
 &gt; naclsdk update
@@ skipping 76 matching lines @@
 information about the SDK and new bundles.</li>
 <li>If you&#8217;re just starting with Native Client, we recommend reading the
 <a class="reference external" href="../overview">Technical Overview</a> and walking through the
 <a class="reference external" href="devguide/tutorial/tutorial-part1">Getting Started Tutorial</a>.</li>
 <li>If you&#8217;d rather dive in, see
 <a class="reference external" href="devguide/devcycle/building">Building Native Client Modules</a>.</li>
 </ul>
 </section>
 
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