Stop using deprecated Conduit methods in arc

Summary:
  - Replace `maniphest.find` with `maniphest.query`. These calls are nearly identical, it was just a rename for consistency.
  - Replace `differential.find` with `differential.query`.

Test Plan:
  - Ran `arc tasks`.
  - Ran `arc close-revision` on valid, nonexistent, and existent-but-invalid revisions.

Reviewers: btrahan

Reviewed By: btrahan

CC: aran

Differential Revision: https://secure.phabricator.com/D6336

src/workflow/ArcanistCloseRevisionWorkflow.php

@@ -79,19 +79,17 @@ EOTEXT
     $revision_id = reset($revision_list);
     $revision_id = $this->normalizeRevisionID($revision_id);
 
-    $revision = null;
-    try {
-      $revision = $conduit->callMethodSynchronous(
-        'differential.getrevision',
-        array(
-          'revision_id' => $revision_id,
-        ));
-    } catch (Exception $ex) {
-      if (!$is_finalize) {
-        throw new ArcanistUsageException(
-          "Revision D{$revision_id} does not exist."
-        );
-      }
+    $revisions = $conduit->callMethodSynchronous(
+      'differential.query',
+      array(
+        'ids' => array($revision_id),
+      ));
+    $revision = head($revisions);
+
+    if (!$revision && !$is_finalize) {
+      throw new ArcanistUsageException(
+        "Revision D{$revision_id} does not exist."
+      );
     }
 
     $status_accepted = ArcanistDifferentialRevisionStatus::ACCEPTED;

src/workflow/ArcanistTasksWorkflow.php

@@ -253,7 +253,7 @@ EOTEXT
     $find_params['status'] = ($status ? "status-".$status : "status-open");
 
     $tasks = $conduit->callMethodSynchronous(
-      'maniphest.find',
+      'maniphest.query',
       $find_params);
 
     return $tasks;