mash: Remove StatusAreaWidget references from system tray classes

ash/system/web_notification/web_notification_tray_unittest.cc

Index: ash/system/web_notification/web_notification_tray_unittest.cc
diff --git a/ash/system/web_notification/web_notification_tray_unittest.cc b/ash/system/web_notification/web_notification_tray_unittest.cc
index f61f2b201bf33e2414f6d85fa0ac583e85153c78..34bfb66a4aa18e2934d57922d733c65c83068a7f 100644
--- a/ash/system/web_notification/web_notification_tray_unittest.cc
+++ b/ash/system/web_notification/web_notification_tray_unittest.cc
@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#include "ash/system/web_notification/web_notification_tray.h"
+#include "ash/common/system/web_notification/web_notification_tray.h"
 
 #include <utility>
 #include <vector>
@@ -10,6 +10,7 @@
 #include "ash/common/shelf/wm_shelf.h"
 #include "ash/common/shell_window_ids.h"
 #include "ash/common/system/tray/system_tray_item.h"
+#include "ash/common/system/web_notification/ash_popup_alignment_delegate.h"
 #include "ash/common/wm/window_state.h"
 #include "ash/common/wm_lookup.h"
 #include "ash/common/wm_root_window_controller.h"
@@ -19,7 +20,6 @@
 #include "ash/shell.h"
 #include "ash/system/status_area_widget.h"
 #include "ash/system/tray/system_tray.h"
-#include "ash/system/web_notification/ash_popup_alignment_delegate.h"
 #include "ash/test/ash_test_base.h"
 #include "ash/test/status_area_widget_test_helper.h"
 #include "ash/test/test_system_tray_delegate.h"
@@ -89,6 +89,7 @@ class TestItem : public SystemTrayItem {
 
 }  // namespace
 
+// TODO(jamescook): Move this to //ash/common. http://crbug.com/620955
 class WebNotificationTrayTest : public test::AshTestBase {
  public:
   WebNotificationTrayTest() {}