fixes bug 92459 "nsAboutCacheEntry should use a cache session w/ DoomEntriesIfExpired set to FALSE"

r=bbaetz, sr=mscott

netwerk/protocol/about/src/nsAboutCacheEntry.cpp

@@ -310,6 +310,9 @@ nsAboutCacheEntry::AsyncOpen(nsIStreamListener *listener, nsISupports *context)
                              getter_AddRefs(mCacheSession));
     if (NS_FAILED(rv)) return rv;
 
+    rv = mCacheSession->SetDoomEntriesIfExpired(PR_FALSE);
+    if (NS_FAILED(rv)) return rv;
+
     mListener = listener;
     mListenerContext = context;