Fix a bug where we get an extra resize event for background tabs.

chrome/browser/gtk/tab_contents_container_gtk.cc

Index: chrome/browser/gtk/tab_contents_container_gtk.cc
diff --git a/chrome/browser/gtk/tab_contents_container_gtk.cc b/chrome/browser/gtk/tab_contents_container_gtk.cc
index 3deda09841734795892a61604dad7324b02a4466..2c64dff4a17b6735659847f983c3f2960449209c 100644
--- a/chrome/browser/gtk/tab_contents_container_gtk.cc
+++ b/chrome/browser/gtk/tab_contents_container_gtk.cc
@@ -18,6 +18,8 @@ namespace {
 // |allocation|.
 void ResizeChildren(GtkWidget* widget, void* param) {
   GtkAllocation* allocation = reinterpret_cast<GtkAllocation*>(param);
+  if (!GTK_WIDGET_VISIBLE(widget))
+    return;
 
   if (widget->allocation.width != allocation->width ||
       widget->allocation.height != allocation->height) {