Update references to the extension gallery.

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

 <div id="pageData-name" class="pageData">Formats: Manifest Files</div>
 <div id="pageData-showTOC" class="pageData">true</div>
 
 <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>
 
@@ skipping 124 matching lines @@
 <a href="http://dvcs.w3.org/hg/content-security-policy/raw-file/tip/csp-specification.dev.html">Content Security Policy specification</a>.
 </p>
 
 
 <h3 id="homepage_url">homepage_url</h3>
 
 <p>
 The URL of the homepage for this extension. The extensions management page (chrome://extensions)
 will contain a link to this URL.  This field is particularly useful if you
 <a href="hosting.html">host the extension on your own site</a>. If you distribute your
-extension using the <a href="https://chrome.google.com/extensions">Extensions Gallery</a> or <a href="https://chrome.google.com/webstore">Chrome Web Store</a>,
+extension using the <a href="https://chrome.google.com/webstore">Chrome Web Store</a>,
 the homepage URL defaults to the extension's own page.
 </p>
 
 <h3 id="icons">icons</h3>
 
 <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,
@@ skipping 460 matching lines @@
 A missing integer is equal to zero.
 For example, 1.1.9.9999 is newer than 1.1.
 </p>
 
 <p>
 For more information, see
 <a href="autoupdate.html">Autoupdating</a>.
 </p>
 
 <!-- [PENDING: Possibly: point to the store/dashboard and make a big deal of the fact that autoupdating is free if you use them.] -->