Fix crash when swapping in a prerendered page for a page which has an unload handler.

chrome/browser/prerender/prerender_manager.cc

Index: chrome/browser/prerender/prerender_manager.cc
diff --git a/chrome/browser/prerender/prerender_manager.cc b/chrome/browser/prerender/prerender_manager.cc
index 09795894aefbc7fa3ed67c45926a1e725b42ddae..9ef807b0ad3046ea84c3b4168ed2ca13e7b79fa3 100644
--- a/chrome/browser/prerender/prerender_manager.cc
+++ b/chrome/browser/prerender/prerender_manager.cc
@@ -80,6 +80,7 @@ class PrerenderManager::OnCloseTabContentsDeleter : public TabContentsDelegate {
   }
 
   virtual void CloseContents(TabContents* source) OVERRIDE {

[dominich, 2011/06/09 01:59:52]

if |source| should be |tab_->tab_contents()| here, and I'm not sure that it is,
please CHECK.

[cbentzel, 2011/06/09 02:08:54]

Yes, it should be. Other delegates aren't necessarily restricted to a single
TabContents, but this one is.

+    tab_->tab_contents()->set_delegate(NULL);

[dominich, 2011/06/09 01:59:52]

maybe CHECK that |tab_->tab_contents()| is not NULL before calling this.

     manager_->ScheduleDeleteOldTabContents(tab_.release(), this);
   }