Remove getIconName from all applications

Summary: Not used anymore

Test Plan: grep for 'getIconName'

Reviewers: btrahan, epriestley

Reviewed By: epriestley

Subscribers: hach-que, Korvin, epriestley

Differential Revision: https://secure.phabricator.com/D11582

src/applications/phpast/application/PhabricatorPHPASTApplication.php

@@ -10,10 +10,6 @@ final class PhabricatorPHPASTApplication extends PhabricatorApplication {
     return '/xhpast/';
   }
 
-  public function getIconName() {
-    return 'phpast';
-  }
-
   public function getFontIcon() {
     return 'fa-ambulance';
   }