Minor, unbreak other changeset APIs.

src/applications/diffusion/controller/diff/DiffusionDiffController.php

@@ -53,6 +53,9 @@ final class DiffusionDiffController extends DiffusionController {
     $output = $parser->render($range_s, $range_e, $mask);
 
     return id(new AphrontAjaxResponse())
-      ->setContent($output);
+      ->setContent(
+        array(
+          'changeset' => $output,
+        ));
   }
 }

src/applications/maniphest/controller/descriptionchange/ManiphestTaskDescriptionChangeController.php

@@ -72,7 +72,10 @@ final class ManiphestTaskDescriptionChangeController
     $view->setRenderFullSummary(true);
     $view->setRangeSpecification($request->getStr('range'));
 
-    return id(new AphrontAjaxResponse())->setContent($view->render());
+    return id(new AphrontAjaxResponse())->setContent(
+      array(
+        'changeset' => $view->render(),
+      ));
   }
 
 }

src/applications/phriction/controller/diff/PhrictionDiffController.php

@@ -93,7 +93,10 @@ final class PhrictionDiffController
     $output = $parser->render($range_s, $range_e, $mask);
 
     if ($request->isAjax()) {
-      return id(new AphrontAjaxResponse())->setContent($output);
+      return id(new AphrontAjaxResponse())->setContent(
+        array(
+          'changeset' => $output,
+        ));
     }
 
     require_celerity_resource('differential-changeset-view-css');