ash: Explicitly teach various components about ShelfLayoutManager.

ash/focus_cycler_unittest.cc

Index: ash/focus_cycler_unittest.cc
diff --git a/ash/focus_cycler_unittest.cc b/ash/focus_cycler_unittest.cc
index 8e263a77ea6e526776c6cdb6a2213fc695129c85..64ed1fe0ca4c3447f0a3c5770581cdc4972de302 100644
--- a/ash/focus_cycler_unittest.cc
+++ b/ash/focus_cycler_unittest.cc
@@ -6,6 +6,7 @@
 
 #include "ash/root_window_controller.h"
 #include "ash/shelf/shelf.h"
+#include "ash/shelf/shelf_layout_manager.h"
 #include "ash/shelf/shelf_widget.h"
 #include "ash/shell.h"
 #include "ash/shell_factory.h"
@@ -93,7 +94,9 @@ class FocusCyclerTest : public AshTestBase {
         Shell::GetPrimaryRootWindowController()->GetContainer(
             ash::kShellWindowId_StatusContainer);
 
-    StatusAreaWidget* widget = new StatusAreaWidget(parent);
+    StatusAreaWidget* widget = new StatusAreaWidget(
+        parent,
+        ShelfLayoutManager::ForShelf(parent->GetRootWindow())->shelf_widget());
     widget->CreateTrayViews();
     widget->Show();
     tray_.reset(widget->system_tray());