Add migration to WebAssembly information to PNaCl / NaCl docs.

native_client_sdk/doc_generated/cds2014/index.html

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-<section id="chrome-dev-summit-2014-native-client-codelabs">
-<span id="cds2014"></span><h1 id="chrome-dev-summit-2014-native-client-codelabs"><span id="cds2014"></span>Chrome Dev Summit 2014 - Native Client Codelabs</h1>
+<b><font color="#cc0000">
+NOTE:
+Deprecation of the technologies described here has been announced
+for platforms other than ChromeOS.<br/>
+Please visit our
+<a href="/native-client/migration">migration guide</a>
+for details.
+</font></b>
+<hr/><section id="chrome-dev-summit-2014-native-client-codelabs">
+<h1 id="chrome-dev-summit-2014-native-client-codelabs">Chrome Dev Summit 2014 - Native Client Codelabs</h1>
 <h2 id="a-crossroads">A Crossroads</h2>
 <p>For your coding pleasure, we have two codelabs.
 Depending on your interests and prior experience,
 check out one or both.</p>
 <p>Learn how easy it is to edit, build, and run NaCl applications
 all in your desktop web browser or on a Chromebook.</p>
 <h2 id="codelab-1-what-a-difference-python-makes">Codelab #1 - What a Difference Python Makes</h2>
 <p>Learn how you can use client-side Python on your webpage.
 Use the python <a href="https://docs.python.org/2/library/difflib.html"
  target="_blank">difflib</a> module to generate attractive online
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 </script></li>
 <li>A fast broadband connection (500MB download)</li>
 <li>Can read and write C++</li>
 </ul>
 </dd>
 </dl>
 <p><a class="reference external" href="cpp">Click here for Codelab #2 - A Saga of Fire and Water</a></p>
 </section>
 
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