Remove obsolete code from ManiphestTaskQuery

Summary:
Ref T603. Cleans up some obsolete stuff here:

  - We no longer ever query by min/max priority (instead, `withPriorities(...)`).
  - A parent class provides limit/offset.
  - Result count is no longer reliable with policies. We could do "about X tasks" or something, but just drop it for now. There's only one remaining callsite anyway.

Test Plan:
  - `grep`
  - Viewed task list.
  - Viewed a project page.

Reviewers: btrahan

Reviewed By: btrahan

CC: aran

Maniphest Tasks: T603

Differential Revision: https://secure.phabricator.com/D7121

src/applications/project/controller/PhabricatorProjectProfileController.php

@@ -158,10 +158,8 @@ final class PhabricatorProjectProfileController
       ->withAnyProjects(array($project->getPHID()))
       ->withStatus(ManiphestTaskQuery::STATUS_OPEN)
       ->setOrderBy(ManiphestTaskQuery::ORDER_PRIORITY)
-      ->setLimit(10)
-      ->setCalculateRows(true);
+      ->setLimit(10);
     $tasks = $query->execute();
-    $count = $query->getRowCount();
 
     $phids = mpull($tasks, 'getOwnerPHID');
     $phids = array_merge(
@@ -175,8 +173,6 @@ final class PhabricatorProjectProfileController
     $task_list->setTasks($tasks);
     $task_list->setHandles($handles);
 
-    $open = number_format($count);
-
     $content = hsprintf(
       '<div class="phabricator-profile-info-group profile-wrap-responsive">
         <h1 class="phabricator-profile-info-header">%s</h1>'.
@@ -184,7 +180,7 @@ final class PhabricatorProjectProfileController
           '%s'.
         '</div>
       </div>',
-      pht('Open Tasks (%s)', $open),
+      pht('Open Tasks'),
       $task_list);
 
     return $content;