Merge 159156 - Extensions Docs Server: Fix headings with no IDs

chrome/common/extensions/docs/templates/intros/devtools_network.html

 <p id="classSummary">
 Use the <code>chrome.devtools.network</code> module to retrieve
 the information about network requests displayed by the Developer Tools
 in the Network panel.
 </p><p>
 See <a href="devtools.html">DevTools APIs summary</a> for
 general introduction to using Developer Tools APIs</a>.
 </p>
 
-<h2>Overview</h2>
+<h2 id="overview">Overview</h2>
 
 <p>
 Network requests information is represented in the HTTP Archive format
 (<em>HAR</em>). The description of HAR is outside of scope of this document,
 please refer to <a href=
 "http://www.softwareishard.com/blog/har-12-spec/">
 HAR v1.2 Specification</a>.
 </p><p>
 In terms of HAR, the
 <code>chrome.devtools.network.getHAR()</code> method returns
@@ skipping 22 matching lines @@
       if (request.response.bodySize > 40*1024)
       chrome.experimental.devtools.console.addMessage(
           chrome.experimental.devtools.console.Severity.Warning,
           "Large image: " + request.request.url);
 });
 </pre>
 
 <p>
 You can find more examples that use this API in
 <a href="samples.html#devtools.network">Samples</a>.
-</p>
+</p>