Bug 467648. Fix shutdown leak by making sure to clear out the deferred DNS prefetch queue at shutdown. r+sr=bzbarsky

content/html/content/src/nsHTMLDNSPrefetch.cpp

@@ -203,6 +203,14 @@ nsHTMLDNSPrefetch::nsDeferrals::nsDeferrals()
 {
 }
 
+nsHTMLDNSPrefetch::nsDeferrals::~nsDeferrals()
+{
+  while (mHead != mTail) {
+    mEntries[mTail].mURI = nsnull;
+    mTail = (mTail + 1) & sMaxDeferredMask;
+  }
+}
+
 NS_IMPL_THREADSAFE_ISUPPORTS3(nsHTMLDNSPrefetch::nsDeferrals,
                               nsIDNSListener,
                               nsIWebProgressListener,

content/html/content/src/nsHTMLDNSPrefetch.h

@@ -96,7 +96,7 @@ public:
     nsresult Add(PRUint16 flags, nsIURI *aURI);
     
   private:
-    ~nsDeferrals() {}
+    ~nsDeferrals();
     
     void SubmitQueue();