fix 404

docs/debugger-protocol.html

@@ -123,9 +123,9 @@ owners are responsible for exposing debugging connections to the external
 users.</p>
 
 <h2 id="extension">Using debugger extension API</h2>
-<p>In order to allow third parties experimenting with the protocol, we introduced
-<a href="http://code.google.com/chrome/extensions/trunk/experimental.debugger.html">
-chrome.experimental.debugger</a> extension API that exposes this JSON message
+<p>To allow third parties to interact with the protocol, we introduced
+<a href="https://developer.chrome.com/extensions/debugger.html">
+chrome.debugger</a> extension API that exposes this JSON message
 transport interface. As a result, you can not only attach to the remotely
 running Chrome instance, but also instrument it from its own extension.</p>