During upgrade to the Chromium 61 we have switched from GTK2 to GTK3
and now we have a few warnings about stuff being deprecated in GTK3.
Check any Linux build to get a list of them.

/cc @zcbenz 
atom/browser/ui/views/menu_bar.cc
SkColor* hover, SkColor* background) {
  GtkWidget* menu_bar = gtk_menu_bar_new();
  GtkStyle* style = gtk_rc_get_style(menu_bar);
  *enabled = libgtkui::GdkColorToSkColor(style->fg[GTK_STATE_NORMAL]);
  *disabled = libgtkui::GdkColorToSkColor(style->fg[GTK_STATE_INSENSITIVE]);
  *highlight = libgtkui::GdkColorToSkColor(style->fg[GTK_STATE_SELECTED]);
  *hover = libgtkui::GdkColorToSkColor(style->fg[GTK_STATE_PRELIGHT]);
  *background = libgtkui::GdkColorToSkColor(style->bg[GTK_STATE_NORMAL]);
  gtk_widget_destroy(menu_bar);
}
#endif
}  
MenuBar::MenuBar(NativeWindow* window)