Removed (spurious, touch-initiated) tooltips from nav buttons

ui/views/corewm/tooltip_controller.h

Index: ui/views/corewm/tooltip_controller.h
diff --git a/ui/views/corewm/tooltip_controller.h b/ui/views/corewm/tooltip_controller.h
index 630df7442d349e268734479a3f954582e7e3681a..68d3fb6a6a3889de2927f621de69331ef92bc44e 100644
--- a/ui/views/corewm/tooltip_controller.h
+++ b/ui/views/corewm/tooltip_controller.h
@@ -111,8 +111,9 @@ class VIEWS_EXPORT TooltipController
   // this timer fires.
   base::OneShotTimer tooltip_shown_timer_;
 
-  // Location of the last event in |tooltip_window_|'s coordinates.
+  // Location of the last events in |tooltip_window_|'s coordinates.
   gfx::Point curr_mouse_loc_;
+  gfx::Point last_touch_loc_;
 
   bool tooltips_enabled_;