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

ui/views/bubble/bubble_delegate.h

 // 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.
 
 #ifndef UI_VIEWS_BUBBLE_BUBBLE_DELEGATE_H_
 #define UI_VIEWS_BUBBLE_BUBBLE_DELEGATE_H_
 
 #include "base/gtest_prod_util.h"
 #include "ui/base/animation/animation_delegate.h"
 #include "ui/views/bubble/bubble_border.h"
@@ skipping 95 matching lines @@
   // Fade-in calls Widget::Show; fade-out calls Widget::Close upon completion.
   void StartFade(bool fade_in);
 
   // Restores bubble opacity to its value before StartFade() was called.
   void ResetFade();
 
   // Sets the bubble alignment relative to the anchor. This may only be called
   // after calling CreateBubble.
   void SetAlignment(BubbleBorder::BubbleAlignment alignment);
 
+  // Sets the bubble arrow paint type.
+  void SetArrowPaintType(BubbleBorder::ArrowPaintType paint_type);
+
  protected:
   // Get bubble bounds from the anchor rect and client view's preferred size.
   virtual gfx::Rect GetBubbleBounds();
 
   // Returns the duration in milliseconds for the fade animation.
   virtual int GetFadeDuration();
 
   // View overrides:
   virtual bool AcceleratorPressed(const ui::Accelerator& accelerator) OVERRIDE;
   virtual void OnNativeThemeChanged(const ui::NativeTheme* theme) OVERRIDE;
@@ skipping 78 matching lines @@
 
   // Parent native window of the bubble.
   gfx::NativeView parent_window_;
 
   DISALLOW_COPY_AND_ASSIGN(BubbleDelegateView);
 };
 
 }  // namespace views
 
 #endif  // UI_VIEWS_BUBBLE_BUBBLE_DELEGATE_H_