Moving the MHTML API out of experimental and renaming it.

chrome/common/extensions/docs/static/pageCapture.html

 <!-- BEGIN AUTHORED CONTENT -->
 <p>
-The savePage API allows you to save a tab as MHTML.
+The pageCapture API allows you to save a tab as MHTML.
 </p>
 
 <p>
 MHTML is a <a href="http://tools.ietf.org/html/rfc2557">standard format</a>
 supported by most browsers. It encapsulates in a single file a page and all
 its resources (CSS files, images..).
 </p>
 
 <p>
 Note that for security reasons a MHTML file can only be loaded from the file
 system and that it can only be loaded in the main frame.
 </p>
 
 <h2 id="manifest">Manifest</h2>
 
-<p>
-The savePage API is currently
-experimental, so you must declare the "experimental"
-permission to use it.
+
+<p>You must declare the "pageCapture" permission
+in the <a href="manifest.html">extension manifest</a>
+to use the history API.
+For example:</p>
+<pre>{
+  "name": "My extension",
+  ...
+  <b>"permissions": [
+    "pageCapture"
+  ]</b>,
+  ...
+}</pre>
 
 <!-- END AUTHORED CONTENT -->