Make repost form warning tab-modal on Gtk.

chrome/browser/tab_contents/tab_contents.cc

Index: chrome/browser/tab_contents/tab_contents.cc
diff --git a/chrome/browser/tab_contents/tab_contents.cc b/chrome/browser/tab_contents/tab_contents.cc
index 464531507a25d2ac7d8d71ec16eb451a5494f883..3c36786e358096f28d93c375200b676936a4921b 100644
--- a/chrome/browser/tab_contents/tab_contents.cc
+++ b/chrome/browser/tab_contents/tab_contents.cc
@@ -1073,8 +1073,10 @@ void TabContents::WillClose(ConstrainedWindow* window) {
   bool removed_topmost_window = it == child_windows_.begin();
   if (it != child_windows_.end())
     child_windows_.erase(it);
-  if (removed_topmost_window && child_windows_.size() > 0) {
-    child_windows_[0]->ShowConstrainedWindow();
+  if (child_windows_.size() > 0) {
+    if (removed_topmost_window) {
+      child_windows_[0]->ShowConstrainedWindow();
+    }
     BlockTabContent(true);
   } else {
     BlockTabContent(false);