Freeze "phriction.history" in favor of "phriction.content.search"

Summary: Depends on D19097. Ref T13077. Freeze the older method now that the newer one is available.

Test Plan: Viewed the older method's page and saw it frozen; called it to make sure I didn't break it by accident.

Maniphest Tasks: T13077

Differential Revision: https://secure.phabricator.com/D19098

src/applications/phriction/conduit/PhrictionHistoryConduitAPIMethod.php

@@ -10,6 +10,16 @@ final class PhrictionHistoryConduitAPIMethod extends PhrictionConduitAPIMethod {
     return pht('Retrieve history about a Phriction document.');
   }
 
+  public function getMethodStatus() {
+    return self::METHOD_STATUS_FROZEN;
+  }
+
+  public function getMethodStatusDescription() {
+    return pht(
+      'This method is frozen and will eventually be deprecated. New code '.
+      'should use "phriction.content.search" instead.');
+  }
+
   protected function defineParamTypes() {
     return array(
       'slug' => 'required string',