GTK: Try to position info bubbles onscreen.

chrome/browser/gtk/location_bar_view_gtk.cc

Index: chrome/browser/gtk/location_bar_view_gtk.cc
diff --git a/chrome/browser/gtk/location_bar_view_gtk.cc b/chrome/browser/gtk/location_bar_view_gtk.cc
index 086cf9745abb62cd0fc67c8a12678cd7883832ad..4027d4e905fd0bb01e0ea2b41a249367a4f25ddb 100644
--- a/chrome/browser/gtk/location_bar_view_gtk.cc
+++ b/chrome/browser/gtk/location_bar_view_gtk.cc
@@ -151,8 +151,6 @@ void LocationBarViewGtk::Init(bool popup_window_mode) {
   gtk_container_set_border_width(GTK_CONTAINER(hbox_.get()), kHboxBorder);
   // We will paint for the alignment, to paint the background and border.
   gtk_widget_set_app_paintable(hbox_.get(), TRUE);
-  // Have GTK double buffer around the expose signal.
-  gtk_widget_set_double_buffered(hbox_.get(), TRUE);
   // Redraw the whole location bar when it changes size (e.g., when toggling
   // the home button on/off.
   gtk_widget_set_redraw_on_allocate(hbox_.get(), TRUE);