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

ui/views/bubble/bubble_delegate.cc

Index: ui/views/bubble/bubble_delegate.cc
diff --git a/ui/views/bubble/bubble_delegate.cc b/ui/views/bubble/bubble_delegate.cc
index a713e43be8df947344c16b3dfe0fa02601945ef9..0cde9569e8d8d90ff8e5e55d8a420535c165c593 100644
--- a/ui/views/bubble/bubble_delegate.cc
+++ b/ui/views/bubble/bubble_delegate.cc
@@ -277,6 +277,11 @@ void BubbleDelegateView::SetAlignment(BubbleBorder::BubbleAlignment alignment) {
   SizeToContents();
 }
 
+void BubbleDelegateView::SetArrowPaintType(
+    BubbleBorder::ArrowPaintType paint_type) {
+  GetBubbleFrameView()->bubble_border()->set_paint_arrow(paint_type);

[msw, 2013/06/14 21:53:03]

This should probably call SizeToContents(). If the bubble is already showing and
changes from NORMAL/TRANSPARENT (reserving space for the arrow) to NONE (no
space is reserved for the arrow) or vice versa, then the overall bubble position
and widget size would change.

[Mr4D (OOO till 08-26), 2013/06/15 02:16:23]

Done.

+}
+
 bool BubbleDelegateView::AcceleratorPressed(
     const ui::Accelerator& accelerator) {
   if (!close_on_esc() || accelerator.key_code() != ui::VKEY_ESCAPE)