Use PhutilClassMapQuery

Summary: Use `PhutilClassMapQuery` where appropriate.

Test Plan: `arc unit`

Reviewers: epriestley, #blessed_reviewers

Reviewed By: epriestley, #blessed_reviewers

Subscribers: epriestley, Korvin

Differential Revision: https://secure.phabricator.com/D13428

src/lint/linter/xhpast/ArcanistXHPASTLinterRule.php

@@ -6,29 +6,10 @@ abstract class ArcanistXHPASTLinterRule extends Phobject {
   private $lintID = null;
 
   final public static function loadAllRules() {
-    $rules = array();
-
-    $symbols = id(new PhutilSymbolLoader())
+    return id(new PhutilClassMapQuery())
       ->setAncestorClass(__CLASS__)
-      ->loadObjects();
-
-    foreach ($symbols as $class => $rule) {
-      $id = $rule->getLintID();
-
-      if (isset($rules[$id])) {
-        throw new Exception(
-          pht(
-            'Two linter rules (`%s`, `%s`) share the same lint ID (%d). '.
-            'Each linter rule must have a unique ID.',
-            $class,
-            get_class($rules[$id]),
-            $id));
-      }
-
-      $rules[$id] = $rule;
-    }
-
-    return $rules;
+      ->setUniqueMethod('getLintID')
+      ->execute();
   }
 
   final public function getLintID() {