Pass shelf instances, not root windows, for ash context menus.

ash/root_window_controller.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ash/root_window_controller.h"
 
 #include <queue>
 #include <vector>
 
 #include "ash/ash_constants.h"
@@ skipping 543 matching lines @@
   // triggers this for valid reasons, it should test status_area_widget first.
   CHECK(shelf_->status_area_widget());
   return shelf_->status_area_widget()->system_tray();
 }
 
 void RootWindowController::ShowContextMenu(const gfx::Point& location_in_screen,
                                            ui::MenuSourceType source_type) {
   ShellDelegate* delegate = Shell::GetInstance()->delegate();
   DCHECK(delegate);
   scoped_ptr<ui::MenuModel> menu_model(
-      delegate->CreateContextMenu(GetRootWindow(), nullptr));
+      delegate->CreateContextMenu(shelf_->shelf(), nullptr));
   if (!menu_model)
     return;
 
   // Background controller may not be set yet if user clicked on status are
   // before initial animation completion. See crbug.com/222218
   if (!wallpaper_controller_.get())
     return;
 
   views::MenuRunner menu_runner(menu_model.get(),
                                 views::MenuRunner::CONTEXT_MENU);
@@ skipping 474 matching lines @@
   else
     DisableTouchHudProjection();
 }
 
 RootWindowController* GetRootWindowController(
     const aura::Window* root_window) {
   return root_window ? GetRootWindowSettings(root_window)->controller : NULL;
 }
 
 }  // namespace ash