Automatically build mobile menus from navigation, and clean up external ProfileMenu API

Summary:
Depends on D20355. Ref T13275. Ref T13247. Currently, "Hamburger" menus are not automatically built from navigation menus. However, this is (I'm almost completely sure?) a reasonable and appropriate default behavior, and saves us some code around profile menus.

With this rule in place, we can remove `setApplicationMenu()` and `getApplicationMenu()` from `StandardPageView`, since they have no callers.

This also updates a lot of profile menu callsites to a new API which is added in the next change.

Test Plan: See the next two changes.

Reviewers: amckinley

Reviewed By: amckinley

Maniphest Tasks: T13275, T13247

Differential Revision: https://secure.phabricator.com/D20356

src/applications/project/controller/PhabricatorProjectBoardViewController.php

@@ -172,7 +172,9 @@ final class PhabricatorProjectBoardViewController
         return $content;
       }
 
-      $nav = $this->newWorkboardProfileMenu();
+      $nav = $this->newNavigation(
+        $project,
+        PhabricatorProject::ITEM_WORKBOARD);
 
       $crumbs = $this->buildApplicationCrumbs();
       $crumbs->addTextCrumb(pht('Workboard'));
@@ -719,7 +721,9 @@ final class PhabricatorProjectBoardViewController
       ->appendChild($board)
       ->addClass('project-board-wrapper');
 
-    $nav = $this->newWorkboardProfileMenu();
+    $nav = $this->newNavigation(
+      $project,
+      PhabricatorProject::ITEM_WORKBOARD);
 
     $divider = id(new PHUIListItemView())
       ->setType(PHUIListItemView::TYPE_DIVIDER);
@@ -1503,15 +1507,4 @@ final class PhabricatorProjectBoardViewController
       ->addCancelButton($profile_uri);
   }
 
-  private function newWorkboardProfileMenu() {
-    $default_item = id(new PhabricatorProfileMenuItemConfiguration())
-      ->setBuiltinKey(PhabricatorProject::ITEM_WORKBOARD);
-
-    $menu = parent::getProfileMenu($default_item);
-
-    $menu->addClass('project-board-nav');
-
-    return $menu;
-  }
-
 }