Fix reference to potentially NULL TabContentsWrapper.

chrome/browser/autocomplete/autocomplete_edit.cc

Index: chrome/browser/autocomplete/autocomplete_edit.cc
diff --git a/chrome/browser/autocomplete/autocomplete_edit.cc b/chrome/browser/autocomplete/autocomplete_edit.cc
index 6c971b8243805dcc17ac28307c5952d3da988527..5f99cf9263b8c22a1600d8d2b200c361473217e9 100644
--- a/chrome/browser/autocomplete/autocomplete_edit.cc
+++ b/chrome/browser/autocomplete/autocomplete_edit.cc
@@ -1047,6 +1047,8 @@ void AutocompleteEditModel::DoPrerender(const AutocompleteMatch& match) {
   if (match.destination_url == PermanentURL())
     return;
   TabContentsWrapper* tab = controller_->GetTabContentsWrapper();
+  if (!tab)
+    return;

[Peter Kasting, 2011/12/01 21:03:38]

Nit: It would be nice to write a comment here explaining when this can be NULL. 
(Also for DoInstant() above.)

[dominich, 2011/12/02 00:30:41]

Done.

   prerender::PrerenderManager* prerender_manager =
       prerender::PrerenderManagerFactory::GetForProfile(tab->profile());
   if (prerender_manager) {