336903 - feeds should not run with chrome privileges. Expose a currentDocumentChannel attribute on nsIDocShell to look at the channel of the currently loaded page (so that we can find out its actual real URI, etc vs. what webNavigation thinks it is (originalURI). r=bz sr=darin

docshell/base/nsDocShell.cpp

@@ -1739,6 +1739,27 @@ nsDocShell::AddSessionStorage(const nsACString& aDomain,
     return NS_OK;
 }
 
+NS_IMETHODIMP
+nsDocShell::GetCurrentDocumentChannel(nsIChannel** aResult)
+{
+    *aResult = nsnull;
+    if (!mContentViewer)
+        return NS_OK;
+
+    nsCOMPtr<nsIDOMDocument> domDoc;
+    nsresult rv = mContentViewer->GetDOMDocument(getter_AddRefs(domDoc));
+    if (NS_FAILED(rv))
+        return rv;
+
+    nsCOMPtr<nsIDocument> doc(do_QueryInterface(domDoc));
+    if (doc) {
+      *aResult = doc->GetChannel();
+      NS_IF_ADDREF(*aResult);
+    }
+  
+    return NS_OK;
+}
+
 //*****************************************************************************
 // nsDocShell::nsIDocShellTreeItem
 //*****************************************************************************