Turn off the tip for the sytem tray menu and the app list (ChromeOS).

ash/wm/app_list_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/wm/app_list_controller.h"
 
+#include "ash/ash_switches.h"
 #include "ash/launcher/launcher.h"
 #include "ash/root_window_controller.h"
 #include "ash/shelf/shelf_layout_manager.h"
 #include "ash/shell.h"
 #include "ash/shell_delegate.h"
 #include "ash/shell_window_ids.h"
 #include "ash/wm/property_util.h"
 #include "ui/app_list/app_list_constants.h"
 #include "ui/app_list/pagination_model.h"
 #include "ui/app_list/views/app_list_view.h"
@@ skipping 103 matching lines @@
         Shell::GetInstance()->delegate()->CreateAppListViewDelegate());
     aura::Window* container = GetRootWindowController(window->GetRootWindow())->
         GetContainer(kShellWindowId_AppListContainer);
     view->InitAsBubble(
         container,
         pagination_model_.get(),
         Launcher::ForWindow(container)->GetAppListButtonView(),
         gfx::Point(),
         GetBubbleArrow(container),
         true /* border_accepts_events */);
+    if (ash::switches::UseAlternateShelfLayout())
+      view->SetArrowPaintType(views::BubbleBorder::PAINT_NONE);
     SetView(view);
   }
 }
 
 bool AppListController::IsVisible() const {
   return view_ && view_->GetWidget()->IsVisible();
 }
 
 aura::Window* AppListController::GetWindow() {
   return is_visible_ && view_ ? view_->GetWidget()->GetNativeWindow() : NULL;
@@ skipping 207 matching lines @@
     should_snap_back_ = false;
     ui::ScopedLayerAnimationSettings animation(widget_animator);
     animation.SetTransitionDuration(base::TimeDelta::FromMilliseconds(
         app_list::kOverscrollPageTransitionDurationMs));
     widget->SetBounds(view_bounds_);
   }
 }
 
 }  // namespace internal
 }  // namespace ash