Don't try to paint tabs if there are no tabs to paint.

chrome/browser/gtk/tab_strip_gtk.cc

Index: chrome/browser/gtk/tab_strip_gtk.cc
diff --git a/chrome/browser/gtk/tab_strip_gtk.cc b/chrome/browser/gtk/tab_strip_gtk.cc
index 2e7b4fc0a4f1e4ba1afeac87039fe2a92151ca90..4ea7773657e539e731262e29a2138916eb6dd6b0 100644
--- a/chrome/browser/gtk/tab_strip_gtk.cc
+++ b/chrome/browser/gtk/tab_strip_gtk.cc
@@ -426,6 +426,9 @@ gboolean TabStripGtk::OnExpose(GtkWidget* widget, GdkEventExpose* e,
                          tabstrip->tabstrip_.get()->allocation.width,
                          tabstrip->tabstrip_.get()->allocation.height);
 
+  if (model->count() == 0)
+    return TRUE;
+
   for (int i = 0; i < model->count(); i++) {
     if (i != selected) {
       tabstrip->PaintTab(i, false);