Bug 540642 - Call CanLoadImage before preloading images too. r=bzbarsky sr=dbaron

--HG--
extra : rebase_source : 1f62ba60b054b3afd49abfa8d36292c667c0d1b1

content/base/src/nsDocument.cpp

@@ -7724,7 +7724,10 @@ nsDocument::MaybePreLoadImage(nsIURI* uri)
   // Early exit if the img is already present in the img-cache
   // which indicates that the "real" load has already started and
   // that we shouldn't preload it.
-  if (nsContentUtils::IsImageInCache(uri)) {
+  PRInt16 blockingStatus;
+  if (nsContentUtils::IsImageInCache(uri) ||
+      !nsContentUtils::CanLoadImage(uri, static_cast<nsIDocument *>(this),
+                                    this, NodePrincipal(), &blockingStatus)) {
     return;
   }
 
@@ -7746,6 +7749,7 @@ nsDocument::MaybePreLoadImage(nsIURI* uri)
     mPreloadingImages.AppendObject(request);
   }
 }
+
 class nsDelayedEventDispatcher : public nsRunnable
 {
 public: