Disable HTTP/2 over NPN (with OpenSSL).

chrome/browser/resources/net_internals/spdy_view.html

 <div id=spdy-view-tab-content class=content-box>
   <ul id=spdy-view-status style='margin-top:0'>
     <li>HTTP/2 Enabled: <span jscontent="spdy_enabled"></span></li>
     <!-- "use_alternative_service" is used here since release 46, see
          https://crrev.com/1268313004.  "use_alternate_protocols" is here to
          support importing netlog json files from earlier browsers.
          TODO(bnc): Deprecate around 2016 February. -->
     <li>Use Alternative Service: <span jscontent="$this.use_alternative_services == undefined ? $this.use_alternate_protocols : $this.use_alternative_services"></span></li>
-    <li>Next Protocols: <span jscontent="next_protos"></span></li>
+    <!-- "alpn_protos" and "npn_protos" are used here since release 48, see
+         https://crrev.com/1387363004.  "next_protos" is here to support
+         importing netlog json files from earlier browsers.
+         TODO(bnc): Deprecate around 2016 April. -->
+    <li>ALPN Protocols: <span jscontent="$this.alpn_protos || $this.next_protos"></span></li>
+    <li>NPN Protocols: <span jscontent="$this.npn_protos || $this.next_protos"></span></li>
   </ul>
 
   <h4>HTTP/2 sessions</h4>
   <div id=spdy-view-session-info>
     <!-- Only one of these two are shown -->
     <div jsdisplay="spdySessionInfo.length == 0">None</div>
     <div jsdisplay="spdySessionInfo.length != 0">
       <a href="#events&q=type:HTTP2_SESSION%20is:active">View live HTTP/2 sessions</a>
       <p>
         <table class="styled-table">
@@ skipping 68 matching lines @@
                  https://crrev.com/1043973002.  "alternate_protocol" is here
                  to support importing netlog json files from earlier browsers.
                  TODO(bnc): Deprecate around 2015 October. -->
             <td jscontent="$this.alternative_service || $this.alternate_protocol"></td>
           </tr>
         </tbody>
       </table>
     </div>
   </div>
 </div>