Don't require working copy to generate URIs in owners tool

Summary:
Owners packages might include repositories that are no longer tracked
(or checked out locally), and there's no reason why we need a working copy
to generate a diffusion link. Instead of displaying a red error box, this
diff allows the owners tool to render correctly.

Test Plan:
viewed /owners/view/all/ and /owners/package/395/ and verified no error box
for not having a checkout of the repository.

Reviewers: epriestley, vrana, wez

Reviewed By: epriestley

CC: aran, Korvin

Differential Revision: https://secure.phabricator.com/D3452

src/applications/owners/controller/PhabricatorOwnersDetailController.php

@@ -98,13 +98,10 @@ final class PhabricatorOwnersDetailController
     $path_links = array();
     foreach ($paths as $path) {
       $repo = $repositories[$path->getRepositoryPHID()];
-      $drequest = DiffusionRequest::newFromDictionary(
+      $href = DiffusionRequest::generateDiffusionURI(
         array(
-          'repository' => $repo,
+          'callsign' => $repo->getCallsign(),
           'path'       => $path->getPath(),
-      ));
-      $href = $drequest->generateURI(
-        array(
           'action' => 'browse'
         ));
       $repo_name = '<strong>'.phutil_escape_html($repo->getName()).

src/applications/owners/controller/PhabricatorOwnersListController.php

@@ -262,13 +262,10 @@ final class PhabricatorOwnersListController
       foreach ($pkg_paths as $key => $path) {
         $repo = $repositories[$path->getRepositoryPHID()];
         if ($repo) {
-          $drequest = DiffusionRequest::newFromDictionary(
+          $href = DiffusionRequest::generateDiffusionURI(
             array(
-              'repository' => $repo,
+              'callsign' => $repo->getCallsign(),
               'path'     => $path->getPath(),
-            ));
-          $href = $drequest->generateURI(
-            array(
               'action'   => 'browse',
             ));
           $pkg_paths[$key] =