Clean up DevTools API docs following removal of old APIs

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

 <p>
 See <a href="devtools">DevTools APIs summary</a> for
 general introduction to using Developer Tools APIs</a>.
 </p>
 
 <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,
@@ skipping 18 matching lines @@
 requests returned by <code>getHAR()</code> should match that displayed in
 the Network panel.
 <h2 id="overview-examples">Examples</h2>
 
 <p>The following code logs URLs of all images larger than 40KB as they are
 loaded:</p>
 
 <pre>
 chrome.devtools.network.onRequestFinished.addListener(
     function(request) {
-      if (request.response.bodySize > 40*1024)
-      chrome.experimental.devtools.console.addMessage(
-          chrome.experimental.devtools.console.Severity.Warning,
-          "Large image: " + request.request.url);
+      if (request.response.bodySize > 40*1024) {
+        chrome.devtools.inspectedWindow.eval(
+            'console.log("Large image: " + unescape("' +
+            escape(request.request.url) + '"))');
+      }
 });
 </pre>
 
 <p>
 You can find more examples that use this API in
 <a href="samples#search:devtools.network">Samples</a>.
 </p>