Remove experimental permission from infobars API and moving it to dev channel

chrome/common/extensions/docs/templates/articles/manifest.html

 <h1>Formats: Manifest Files</h1>
 
 
 <p>
 Every extension, installable web app, and theme has a
 <a href="http://www.json.org">JSON</a>-formatted manifest file,
 named <code>manifest.json</code>,
 that provides important information.
 </p>
 
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 <p>
 One or more icons that represent the extension, app, or theme.
 You should always provide a 128x128 icon;
 it's used during installation and by the Chrome Web Store.
 Extensions should also provide a 48x48 icon,
 which is used in the extensions management page
 (chrome://extensions).
 You can also specify a 16x16 icon to be used as the favicon
 for an extension's pages.
 The 16x16 icon is also displayed in the experimental extension
-<a href="experimental.infobars.html">infobar</a>
+<a href="infobars.html">infobar</a>
 feature.
 </p>
 
 <p>
 Icons should generally be in PNG format,
 because PNG has the best support for transparency.
 They can, however, be in any format supported by WebKit,
 including BMP, GIF, ICO, and JPEG.
 Here's an example of specifying the icons:
 </p>
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 goes into more detail about implementing a sandboxing workflow that enables use
 of libraries that would otherwise have issues executing under extension's
 <a href="../extensions/contentSecurityPolicy.html">default Content Security
 Policy</a>.
 </p>
 
 <p>
 Sandboxed page may only be specified when using
 <a href="#manifest_version"><code>manifest_version</code></a> 2 or above.
 </p>