Rename AphrontQueryException subclasses

Summary: Ref T5655. Depends on D10149.

Test Plan: Ran `arc unit`

Reviewers: epriestley, #blessed_reviewers

Reviewed By: epriestley, #blessed_reviewers

Subscribers: epriestley, Korvin, hach-que

Maniphest Tasks: T5655

Differential Revision: https://secure.phabricator.com/D10150

src/applications/auth/controller/PhabricatorAuthRegisterController.php

@@ -304,7 +304,7 @@ final class PhabricatorAuthRegisterController
           }
 
           return $this->loginUser($user);
-        } catch (AphrontQueryDuplicateKeyException $exception) {
+        } catch (AphrontDuplicateKeyQueryException $exception) {
           $same_username = id(new PhabricatorUser())->loadOneWhere(
             'userName = %s',
             $user->getUserName());