Use __CLASS__ instead of hard-coding class names

Summary: Use `__CLASS__` instead of hard-coding class names. Depends on D12605.

Test Plan: Eyeball it.

Reviewers: #blessed_reviewers, epriestley

Reviewed By: #blessed_reviewers, epriestley

Subscribers: hach-que, Korvin, epriestley

Differential Revision: https://secure.phabricator.com/D12806

src/applications/macro/controller/PhabricatorMacroMemeController.php

@@ -14,7 +14,7 @@ final class PhabricatorMacroMemeController
     $lower_text = $request->getStr('lowertext');
     $user = $request->getUser();
 
-    $uri = PhabricatorMacroMemeController::generateMacro($user, $macro_name,
+    $uri = self::generateMacro($user, $macro_name,
       $upper_text, $lower_text);
     if ($uri === false) {
       return new Aphront404Response();