Extensions Docs Server: BranchUtility not fetching branch numbers correctly

BranchUtility was crashing when it tried to fetch the branch numbers for the
dev, beta, and stable channels. There was also a problem using the branch number
where the name should have been used.

ServerInstances are no longer leaked.

BUG=141909

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=151386

Review URL: https://chromiumcodereview.appspot.com/10831269

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@151401 0039d316-1c4b-4281-b951-d872f2087c98

chrome/common/extensions/docs/server2/templates/public/apps/index.html

@@ -96,5 +96,5 @@
       </div>
     </div>
   </body>
-  {{+partials.footer}}
+  {{+partials.apps_footer}}
 </html>

chrome/common/extensions/docs/server2/templates/public/extensions/index.html

@@ -96,5 +96,5 @@
       </div>
     </div>
   </body>
-  {{+partials.footer}}
+  {{+partials.extensions_footer}}
 </html>